my comp. box seemed like an ultimate gaming machine until it became not so new

i only spent 1100 USD all said and done
that being said, i wont be building a new one until... when i cant play any new games with good refresh rates...
so, im likely to upgrade it this sumer
a second 512 stick of ram, new ATX power supply, geforce 6800 or newer, 2x100gb raid setup... and im sure that would last me at least another year or two
that said, what do you need
a MOBO with 4 dim slots
highest pin count amd supported mobo
highest output amd chip
geforce 6800 or newer
1024 mb of ddr
150+gb hdd
hi-res wall projector