Ya I have one suggestion drop the q6600 Retail to an OEM because the q6600 Retail comes with the craptacular, not-awesome Stock Cooler, that could save you a bit
but you don't need SLI unless you got a giant monitor (I don't remember if you do, I had to study for Exams so I didn't bother to remember if you did.. I'll check back on the monitor if you did, let me reread the thread) But I recommend not getting the 8800gts g92, get an eVGA Video Card, and then wait for the 9900gtx to come out, and with the eVGA Step Up program, if you register the card online, and you want a new card within 90 days, you can send the card you have now plus the price difference of the MSRP and you can get a new card