Fallout 2 is a great call
I also used to play Gothic II. (in my humble opinion, the greatest RPG of all times), Morrowind and Diablo II. like crazy.
Oh, and there was this marvellous RPG game called Albion that was something like an introduction to role playing games for me and caused many sleepless nights for the then-teenage _slavo_ :
Anyone familiar with this one?