I've avoided the whole PSP bit for some time, mostly due to the price and originally due to lack of games of interest.  With both Ys games having come out here by X-Seed (Thanks!) and Persona 3 being re-released on it, I'm extremely tempted to pick one up. 
 
There any particular reason to get the PSP 3000 over the PSP-Go or vice versa?  Tried some basic google detective work, but I wasn't pulling much up with my phrasing.

To date the farthest I've gotten in GoW is killing the Hydra :)

I bought a Go and highly regretted it, Just get the 3000 as you have more selection in games and just feels better overall when playing and also has a larger screen.

3000 dude. PSN doesn't have every game up there and plus you can get UMD games a lot cheaper, and still get PSN games with a memory stick. Best of both worlds.

PSP 1000 or 2000 if you want homebrew and emulators lol! Everybody loves to play nes,snes,n64,gba,genesis,pc engine,every ps1 game ever,gbc,neo geo(who doesn't love to play games like metal slug 1-5 arc ver and KOF 94 -2003 Arc Version perfectly emulated and not shoddy port like the official release and more),cp1,cps2(i love playing marvel vs capcom on my psp),neo geo pocket,mame, Cave Shooters,and lots of homebrew like Halo Solitude,Kurok,Cave Story,OpenBor,and much much more.

" PSP 1000 or 2000 if you want homebrew and emulators lol! Everybody loves to play nes,snes,n64,gba,genesis,pc engine,every ps1 game ever,gbc,neo geo(who doesn't love to play games like metal slug 1-5 arc ver and KOF 94 -2003 Arc Version perfectly emulated and not shoddy port like the official release and more),cp1,cps2(i love playing marvel vs capcom on my psp),neo geo pocket,mame, Cave Shooters,and lots of homebrew like Halo Solitude,Kurok,Cave Story,OpenBor,and much much more. "

I really love my PSP but I don't think now's a good time to get a PSP, 3DS out in April (apparently) and there's probably a PSP2 announcement waiting to happen at E3. If you don't mind shelling out the cash for another handheld or sticking with your PSP 1.0 after 2.0 is out then you should get one.  
 
Also, PSP Go is on sale for $150 this weekend in Best Buy, definitely get that if you live in the US.

" Get the PSP 3000, you can play every game on it and its cheaper. The new GoW bundle is a good deal if your interested.  "

I like my Go, it's so damned pocketable, though I'm aware of the limited selection of games.

Go 3000.
 
Personally though, I've always been partial to the old phat 1000 PSPs. They had more weight to them and felt sturdier, which I liked.