I believe that Diablo is similar - this was available on PS1 and PC don't know about PS2 but the PS1 version should work (will be cheap too). My youngest has this on the PC and loves it.
Also could try Fallout: Brotherhood of Steel & Champions of Norath - they are the same game engine as Balders Gate.
Dungeon Siege is same type of stuff too, but not as highly rated as the ones above. Can't really give a personal recommendation as to the best as I've never played any of them.