Baldur's Gate or NWN?

Baldur's Gate 1, BG2, Neverwinter Nights? Or perhaps Fallout 1/2?
Or another game (guess you get the picture what kind of game I want)?

>>4
I downloaded NWN demo, it seems very complete at character construction, but I didn't like how the action goes in battles. Does it get better with bigger enemy groups and higher level skills?

>>5
I played lots of Diablo 1 and 2, but D2 and its expasion gets really boring after a while for the considerably small pool of skills and repetitive enemies and uninteresting areas. Does Baldur's Gate suffer from this same syndrome? How good is it to control various characters at once?