The X1900GT isn't far behind the X1950 pro and both still do good in UT3 and COD4. You'll be able to play them at high details at 12x10 anyway. For $60 it's an amazing card and would be better for those two games than a 7900GT or 7900GS.
Look how well the X1950 pro does in those links. The X1900GT is just a little behind and shares the same 3:1 ALU to texture unit ratio, so would also excel in these games.
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