Dude you've already got a 6800, why would you want a 6600GT?!! Also unless you're wanting to buy an Intel 775 chip, new mobo that supports PCI-E and potentially new ram, you don't want a 6600GT anyway. They won't be AGP models at first only PCI-E. We probly won't see AGP models for another 2 months I wouldn't think. Sorry if I was too harsh, just tryin to explain stuff.
Imitation: he mentioned a LAN, so maybe he has a second system or plans on building one. He wouldn't be able to fit it in his already too long signature anyways.