Yep, DD TDX copper. Silver isn't really worth it IMO. Waaaay too expensive. as for the GPU block, either one is good, depending on what you get. Maze 4 won't fit on a 6800. If you go for a a64 then you don't need any more chipset cooling. as for the pump, go for a Danner Mag Drive 3 or 5 from www.petsmart.com. As of right now I can't tell you how loud they are so I'll leave that to someone else. I'd use 1-2" ID tubing but it depends on your pump. You want 4 fans, 2 pushing and 2 pulling. Make sure you have a shroud for them on that heatercore. Mmm, use distilled water for sure, you can put additive like waterwetter in it, but don't use car coolant as it is slightly corrosive and could damage your system especially your pump.