6600GT Vs 6800nu, best bang for buck?

[Purple]

my setup must be magic

XP2100
512 ddr 333 (corsair maybe)
ABIT Siluro GF4 ti 4200
ABIT KD7 mobo

halflife2:
full everything, NO AA, trilinear AF, 1280, will post the frame rate when i get home

edit: oh i got the new VIA 4 in 1 (hyperon) drivers, which sped it up a fair bit

[Phalanx]

i reckon if they ever make a 256mb version, it would be much better since the 6600 gt seems to struggle at 1600x1200 when filters are turned on

[Purple]

i turned the AF up to 16x and it didnt slow down a huge amount but i could notice and it was less than 25 fps so was a bit sickening so i turned it back to trilinear, i didnt know how to get the console up to turn the FPS on so i didnt get it - suspect it ranges from 20 in the open parts to 40 under ground (with trilinear). although over the weekend i got to the city part with all the rubble and it was starting to get a bit more stuttery but not unplayable, gonna get me a new card mefinks.