Ok, nice specs, here are sites for those 6800GTs you were asking about.
Here is a cheap eVGA (my favorite company)
And here is one for a tiny bit more from Leadtek, but the cooling unit is crazy awesome (great for overclocking!!) I would say its your choice though....
Ok hope that helps. GL with that nice system you got cookin!
THIS MESSAGE APPROVED BY THE GOD OF AMD, AMD ZEN, JK! !
I AM ALL POWERFUL!! AMD IS ALL POWERFUL!!
NEWSFLASH!! INTEL BLOWS!!
BTW: Switch to Crucial Ballistix ram if you are going DDR2!
OR TRY AMPs ram, it is very good, my friend just got this, and WOW is it fast!!
AND YES! it does make a difference between 2X512 and 1GB chips. The 512X2 can multitask better since there are two chips to store things as opposed to only one chip doing everything. That link you have above is actually PC5300 though... It only runs at 667....
PC5400 runs at 675MHz. The AMP ram is real PC5400. Morpheus, I hate to say, but ram companies are all opinion based. I like Kingston and Crucial the most, but I know that the Ballistix Ram can endure the most heat by lab tests, so that is why I would go Ballistix by Crucial.