Ok well why do you NEED liquid cooling? Are you overclocking? If your not a stock heatsink and fan will do you fine. You'll probably looking for something like:
Motherboard: DFI LP UT nF4 SLI-D
CPU: AMD Opteron 170
Ram: Corsair XMS (for overclocking), corsair value select (for non overclocking) both 2GB dual channel.
Videocard(s): e-VGA 7900GT (if you want to get the GTX you'd have to get an ASUS A8N32-SLI Deluxe because of the cards heatsink)
Powersupply: Antec TruePower 550 SLI
I suggest taking a close look at this before buying: http://www.techist.com/showthread.php?threadid=79791