I really want to play an RPG, so which one of these should I get/ which on is the best?  If other, please specify

WITCHER 2! It's the best

Out of those, Witcher 2, easily.

DAO and Witcher 2.   Witcher 2 is like 30$ on steam right now for the summer sale.   

Dragon Age: Origins

Witcher 2. Best time I've had with an RPG in ages.

The Witcher 2 is one of my favorite games; I highly recommend it.

Dragon Age Origins and Awakening is good, but its bummer to play it and know that the sequel is terrible.

Dragon Age 2 - Avoid at all costs.

Borderlands is not a RPG. its a shooter with progression.

Witcher 2 is the superior RPG , but I strongly recommend to play Witcher 1 first.

The Witcher 2: Assassins of Kings. By far the best game on the  list.

Borderlands isn't really and RPG like the others on that list. I'd recommend Borderlands only if you've got one or more friends to play it with.

And yes, The Witcher 2 is pretty good, though it's an obvious answer considering you posted this thread in the Witcher forums.

I think it's funny that Borderlands is beating DA2.

A,B, or C
 
Borderlands is good, but it is hardly an RPG.

Go Witcher 2, then gon DAO. Or maybe the other way around, if you want to see how a little developer crushes the mighty bioware.

Go DAO then Witcher 2 then DA2. Blands is not really a RPG.

If you have a decent PC THE WITCHER 2 smokes every other game on that list.

If you have a moderate PC then DRAGON AGE: ORIGINS is a great game also.

Forget the sequel It was rushed and lame.

WITCHER 2! It's the best

Go Witcher 2, then gon DAO. Or maybe the other way around, if you want to see how a little developer crushes the mighty bioware.

Do a coin toss between Dragon Age Origins + Awakening and The Witcher 2. If you have a good PC and want to give it a good workout, The Witcher 2 looks absolutely AMAZING on top one of the best RPGs this generation. So far, I enjoyed both almost equally. Dragon Age 2 is a pretty good game but it's crap compared the Dragon Age Origins and The Witcher 2. I tried Borderlands but I didn't enjoy it that much.

Witcher 1 if you haven't played it. Then 2.

I voted for DAO. I played through the game a couple years ago and I loved it. DA2, on the other hand, is ass. I stopped playing after ~5 hours. Repetitive and uninteresting. 
 
I might have said Witcher 2 except that I stopped playing it. That simply has to do with a lack of interest in investing time into any game right now, rather than anything wrong with the game itself. It has a beautiful world, interesting characters, and an all-around great fantasy ambiance. It does need a pretty good PC, though. So either DAO or Witcher 2.

Witcher 2 and DA:O.

Out of all the games above I've only finished Dragon Age: Origins right now, so Dragon Age: Origins.

Witcher 2 is my current favorite game and one of the best games to come out in years. Play it.

The witcher!!! awesome game

Dragon Age: Origins - Really good. Highly recommended.
Dragon Age 2 - Decent, but streamlined a lot in comparison to Origins. 
The Witcher 2 - Same as Dragon Age: Origins. I highly recommend it. 
Borderlands - If you like fetch quests and billions of loot, and preferable a duder/dudess to play with, it's an excellent game.