If you get a 8800GTS make sure you get a G92 version or else all benefits over the 8800GT are lost.
The 9000 series isn’t worth the money at this point. They are only marginally faster and are priced much higher. I think the 9800GX2 is only 15% faster than the 8800 Ultra. Wait for the 9900s which will be on the G92b core and have a 55nm process.