Dont get anything thermaltake....thats for sure.....
Danger den is one of the best trusted watercooling manufacturers around. I personally will be replacing my swiftech(also a great WC manufacturer) with a dandgerden loop this summer.
First you do not need the memory or chipset cooler.
For your purposes i would suggest this loop from dangerden-
CPU Style: Intel 775 / Conroe
CPU Water Block: Danger Den TDX
Top Style: Lucite - Clear
Video Card Water Block: Acetal SLI MAZE5 GPU for ATI/Nvidia Series Crossfire Kit (4-hole mount)
Chipset Water Block: None
Fitting Size: 3/8 OD High Flow Fitting for 3/8 ID Tubing
Radiator: Black Ice Xtreme II - Black
Fans: 2x Papst 120mm Fan
Pumps: Eheim 1250 with 3/8 Adaptors
Tubing: 10 Feet of Clearflex
Reservoir: Danger Den HDPE Reservoir
Thermal Paste: Arctic Silver V
Water Additives: MCT-5 Non-Conductive Fluid
Danger Den Fillport: None
Fillport Reservoir: None
Misc: 12 Hose Clamps
BTW dual GPU watercooling is expensive and you would have to get these water blocks for the 8800- Danger Den :: Water Blocks :: Nvidia and ATI GPU and Ram Water Blocks :: DD - 8800 GTX