xterm, there something fundamentally wrong :P and something that I personally consider wrong !
The more pressing issue: Corei7-2600k is dual channel and not triple channel and in order to take advantage you need a memory kit with x2 multiplayer (2 dimms, 4 dimms). Even though what you chose will work perfectly fine, you'll have 2 dimms working in dual mode, and 1 dimm working in single mode. I advise you to choose an 8GB configuration (2 x 4GB).
The meh issue: The graphics card that you chose is 100$ more expensive then this: Asus ENGTX580/2DIS/1536MD5 GeForce GTX 580 1.5GB DDR5 Dual. Exact same model, exact same everything and I would personally go the Asus way. but that's just me ...
Xbitlabs performance test for the Core-i7 2600K
AnandTech review