If you want something older, more involved...might try the Realms of Arkania series. I have two of the three, but can't get them to run properly (with sound). Gold Box games as well, can't go wrong there. Forgotten Realms Archive....umm...Darklands for even more in depth gaming...hehe
All of the above mentions are good too
Baldur's Gate 1&2 is really really good. PM me, I might be able to help you out with BG2 if you need it...