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.
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.
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