Ballad of Gay Tony I think brings back at least some of the crazyness of SA. I personally like IV more than SA, it's a lot more fun to go on rampages. I can kind of understand why people don't like IV very much but it's my favorite GTA game so far.
I played a few hours of the Witcher 2. I really like the combat in the game, but it's really difficult. I don't play many RPGs, even more actiony ones like this game, so it's a nice change of pace for me. The game is gorgeous too.