What Korvaz said about water cooling - not worth it unless you're seriously OCing your system. It's easier and cheaper ot get a case with a fan or two, probably two, pre installed and getting an aftermarket cooling fan for the CPU.
Also what the guys said about 6G of RAM. 2000Mhz sounds like it's factory OC'd, is it? If it it, look at getting the un-pre-OC'd version and doing it yourself for nowt.
As for the gfx card, how much are they charging for it? If it's around the same as a new spankig Radeon 5850, get the 5850. It's the mutt's nuts, bee's knees and parts of other animals, too. It beats the GeFOrce 295 for a shedload less. ATI are really owning the GPU market right now so take advantage of it.
What mobo and PSU are you looking at?