Alright, I just started building my new system with a 3700+, DFI nF4 UT SLI-DR, 1 gig of Corsair XMS TCCD mixed with another gig of OCZ Plat. rev. 2 TCC5, 2 eVGA 7800GT's, Danger Den TDX, DD maze 4 gpu low-profile ( and I'm going to use the block on my 6800GT too), and two Hitachi T7K250's. I have ordered everything except the cpu, videocards,HDD's, and the TDX. My question is, what options do I have for a 1/2" ID chipset block will fit with two 7800GT's?