8800, but which one

[DilTech]

any more comments? How about if I throw the 2900XT into the mix?

The HD2900XT shouldn't be considered currently due to it's AA performance hit at high-resolution. Also, it's a verrrry poor performer in s.t.a.l.k.e.r. which is one of the titles you specifically mentioned.

If you game without AA(and who pays that much for a videocard and doesn't turn on AA), then the HD2900xt might not be a bad choice though.

no one commenting about the fact that if you overclock 8800gts cards the performance does get fairly close to gtx (stock) scores !!!
but you need to get one from manufacturers that are know to have cards that clock well.. and these cards usually cost a bit more.

You can overclock the GTX to meet/beat the ultra. At 1920x1200, gpu power means everything, which is why for that resolution the GTX really is the main choice.