specs: Core 2 Quad Q6600 / 8GB / 2 x 8800 GTX 512MB SLI
grumpsx What is the purpose of your upgrade? For example, can you name 1-3 games that you're most interested in playing right now, and at which resolution? I'm guessing 1280 x 720. Are you only interested in running upgraded GPUs in SLI, or would you be open to a single card? What is your upgrade budget and in which currency is it?
Side note: The 8800 GTX may be 11.5 years old, but it was a beast of a card back in it's day. It also had a $599 sale price, so two of them was quite an investment back than. Also interesting is that the SATA standard wasn't finalized until 2009, therefore I presume that your storage is powered by a 4-pin molex connector, and connected to data via IDE.