I just wanted to see what weapon everyone was choosing to level up to ultimate. So far the only one i've heard for sure is Vanille's Belladonna, other than that i'm not really sure whats best for everyone. I've seen the end stats for all of them but since making them costs so much time and money I don't want to level up the one I think is best only to find out that I needed WeaponY in order to do TaskX easily. 
 
Also the method I have been using to level up equipment is to buy ~30 sturdy bones, use them to get the 3x multiplier, then blow however many turbojets at the same time to hit " * "Level. Is there a better way to go about this?

I think the general consensus is that Sturdy Bone and Vibrant Ooze are the way to get the multipliers up, and then throw in  Ultra-compact Reactors or Perfect Conductors  and there was another one too, but I can't recall it(Not sure on the names exactly, but all the parts sound like they belong in physics experiment anyway, lol) to gain massive EXP. 
 
You definitely want to do as much of the leveling all at once as you can.  So from level 1 to " * " level all in one go to maximize the exp gain from your bones/oozes.  
 
If Turbojets are the best you have access to in the garage, you might just want to wait on upgrading till later in the game when some of the better EXP/gil ratio items go on sale (Perfect Conductors, etc).   Don't worry even with weak weapons and armor you can still do just fine in the main story as long as you have your Crystarium filled out sufficiently.

" I think the general consensus is that Sturdy Bone and Vibrant Ooze are the way to get the multipliers up, and then throw in  Ultra-compact Reactors or Perfect Conductors  and there was another one too, but I can't recall it(Not sure on the names exactly, but all the parts sound like they belong in physics experiment anyway, lol) to gain massive EXP.   You definitely want to do as much of the leveling all at once as you can.  So from level 1 to " * " level all in one go to maximize the exp gain from your bones/oozes.    If Turbojets are the best you have access to in the garage, you might just want to wait on upgrading till later in the game when some of the better EXP/gil ratio items go on sale (Perfect Conductors, etc).   Don't worry even with weak weapons and armor you can still do just fine in the main story as long as you have your Crystarium filled out sufficiently. "

Yeah, that's the method I've been using.  The one's I'm maxing first are:
 
Lightning - Lionheart (Quick Stagger)
Sazh - Antares Deluxes (Chain Bonus Boost)
Snow - Umbra (Improved Ward)
Hope - Hawkeye
Vanille - Belladonna Wand (Improved Debuffing)
Fang - Taming Pole (Stagger Lock)

I used the Dragoon Lance for Fang because it adds just that extra 40 points of damage. I never, ever use her as a Ravager and she has two Power Gloves set on her so her Strength is around 3500, she kills anything.
 
For Lightning, I took the Lionheart because it had pretty decent stats and the Quic Stagger comes in handy. 
 
I never use Sazh so I have no idea. 
 
For Hope I used the Hawkeye because of the really awesome Magic stat, it's over 3000 now. 
 
For Vanille, even though I never use her, the Belladonna Wand is a very good choice. 
 
Snow... I actually used the Feymark for a while and he was my teams extra Ravager when not a Sentinel. But when I needed him on Sentintel I used the Paladin for the increased defense. 
 
EDIT: after looking it up, Sazh has 4 amazing weapons. It's going to be hard to choose for me what to level first. The Antares Deluxes (Chain Bonus Boost), Procyons (Stagger Maintenance), Rigels (Stagger Lock with both stats over 1000 at lv.100!!), and the Spica Defenders (Augment Maintenance).

Based on the stats, the best weapons are: 
 
gladius - lightning   
spica defenders  or deneb duellers - sazh 
power circle - snow 
hawkeye - hope 
belladonna wand - vanille
dragoon lance - fang
    
Obviously it's up to you, some of those weapons give massive boosts to one stat, but not much to the other, so for example if you want lightning to be strong on attack and magic, then gladius might not be the best choice, but for pure attack stats it's the best weapon for her if you use her as a com all the time like I do. 
  
For sazh, the deneb duellers give a bigger magic boost, but the spica defenders have the augment maintenance, which is useful if sazh is your synergist, so that's a judgment call.
 
weapons with stagger lock are stupid, as is the one with leadenstrike/ironstrike, there's no point using them, because the damage boost you get from the extra stats is much less than the damage you do if you stagger an enemy, and some enemies need to be staggered to kill them. Same goes for the weapons with paper/silk trigger, they cut your hp by so much that the extra stats aren't worth it.

" Based on the stats, the best weapons are:  gladius - lightning   spica defenders  or deneb duellers - sazh  power circle - snow  hawkeye - hope  belladonna wand - vanille dragoon lance - fang    Obviously it's up to you, some of those weapons give massive boosts to one stat, but not much to the other, so for example if you want lightning to be strong on attack and magic, then gladius might not be the best choice, but for pure attack stats it's the best weapon for her if you use her as a com all the time like I do.   For sazh, the deneb duellers give a bigger magic boost, but the spica defenders have the augment maintenance, which is useful if sazh is your synergist, so that's a judgment call. weapons with stagger lock are stupid, as is the one with leadenstrike/ironstrike, there's no point using them, because the damage boost you get from the extra stats is much less than the damage you do if you stagger an enemy, and some enemies need to be staggered to kill them. Same goes for the weapons with paper/silk trigger, they cut your hp by so much that the extra stats aren't worth it. "

" @Psytek said:

" Based on the stats, the best weapons are:  gladius - lightning   spica defenders  or deneb duellers - sazh  power circle - snow  hawkeye - hope  belladonna wand - vanille dragoon lance - fang    Obviously it's up to you, some of those weapons give massive boosts to one stat, but not much to the other, so for example if you want lightning to be strong on attack and magic, then gladius might not be the best choice, but for pure attack stats it's the best weapon for her if you use her as a com all the time like I do.   For sazh, the deneb duellers give a bigger magic boost, but the spica defenders have the augment maintenance, which is useful if sazh is your synergist, so that's a judgment call. weapons with stagger lock are stupid, as is the one with leadenstrike/ironstrike, there's no point using them, because the damage boost you get from the extra stats is much less than the damage you do if you stagger an enemy, and some enemies need to be staggered to kill them. Same goes for the weapons with paper/silk trigger, they cut your hp by so much that the extra stats aren't worth it. "

Stagger lock doesn't do much difference if only one use it, because the other two can still stagger. "

" @Viney212:   Dragoon lance has a higher str stat than the taming pole... "

I used Sazh a bunch and found the Pyrocons to be amazing.  They aren't the best stat wise, but they are really helpful early on when you might not have the equipment or CP levels to kill some enemies in a single stagger.  It lets you take out Behemoths and King Behemoths very early on in Ch 11 without much fuss and before they transform which is wonderful for grinding CP or moving about on the Plains when you first get there.

I upgraded the very 1st weapon I get to max
and use the same weapon from beginning to end, and after the end