Wait till the middle of August and get a single 8800 GTX by EVGA and EVGA only, G92 is suppose to be out in November so you'll still be able to use the 3 months step up program and get G92 card for only $150 or so, which will be 2.5x faster.
Also consider going Gigabyte GA-P35-DS3R + Core 2 Duo E6750 instead.
E6750 is compared to X2 6000+ (stock vs stock) here:http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3038&p=6
T here is one on directron.com for $208
Also, get Corsair 620HX and don't look back.