Microcenter is the place for 3570k & mobo combo's. I got mine (3570k+ASRock z77 Extreme 4) for just under $300 and that's with tax. I love my / your PSU too. Great price and warranty - it's silent.
Of note: I have a intel 330 180 GB SSD. I'd suggest it if you have the cash. If not - then try the Samsung 830 or Crucial M4 - both will be great and should run around $100. I assume you have an HDD laying around. My 180 GB is 1/3 full with win7, world of tanks, and Diablo III.
I also waited for the GPU. I reused my MSI PE/OC HD 6850.
This machine is awesome. I've not overclocked yet - no need. My SSD is a constant source of a grin - off to on just under 30 sec w/ password entry. Surfing & game play are awesome and that's with my very average GPU.