I'm going to wait about making judgements about my computer untill I see nwn2's requirements. I don't think I would have much problems because I can play NWN basicly on the highest settings. But even if I couldn't I wouldn't by new hardware just for one game.
if it's for more games I would, like I did not to long ago. Upgrade my graphic-card. I can play most games at very high, for now anyway. I don't wanna think about games 1 year or longer from now.