Well, if you can't play Oblivion you can't play any other of those games I mentioned. And if your computer is too slow for Oblivion, then it surely be too slow for Kotor 3 when/if it comes out.
Same with me though. I'll buy 7900 GT at fall, or I wait to next year and get totally new, ass kicking computer. It is hard to wait though, so I'll propably just buy 7900 GT and new memory.
But I understand your feeling, only reason why I am even considering to buy 7900 GT is because I want to play NWN 2 immeadiatly when it comes out.
Other option is to buy Xbox 360. Besides, Mass Effect seems to be Xcox 360 only game, but Jade Empire was ment to be Xbox only game too...
Meh, I am ranting