Have you tried UT3 yet Bok? How does it run on your jet strapped to a cpu of yours? I can only play it smoothly with settings on low! I'm debating whether to get a new just released 8800GT with the new die shrink or just wait till the Geforce 9 series comes out. THen again the 8800GT is only $250 and its faster then the 8800GTS! How much of a performance boost do you think Ill get from a 7800GT 256MB overcloced to a 8800GT 512MB.
UT3 I'm like averaging 40 FPS on everything high and 2xAA. UT3 is prolly the most demanding (not "crysis demanding" tho) of all the U3 engine games I've played so far. However I think driver updates are going to make it run faster, like Medal of Honor Airborne ran faster after updates.
But yeah it's upgrade time I say. A 7800 GTX to 8800 GTX was night and day, and I'm sure a 7800 GT to 8800 GT would be the same, in every game. You can also wait for 9 series, but that means you can't enjoy UT3 until next year then.