Wait.. no overclocking? In that case, let's switch some stuff around.
Mobo: An H61 or a Z68 Pro3 Gen3 from ASRock (although this allows overclocking)
RAM: 2x4GB sticks of it... about $45
CPU cooler: Without overclocking, you don't need one. Stock Intel is fine.
PSU: Overkill. Get an 80+ Corsair Builder series at 500W maximum
GPU: Upgrade to an MSI Hawk 6870. Or, if you have more money, an MSI Twin Frozr II OC GTX 560 Ti or a 7850 (7850 is better, but more pricey). However, I'd stick with the Hawk 6870.
Case: Either HAF 912 or Antec Three Hundred (Illusion if you want that look. Same price). Antec Three Hundred has fan controllers and a lot of fans, HAF is popular as well.
i5-2400 isn't overclockable. i5-2500k is. The i5-2500 just isn't worth it... it's the same as going with an i5-2500k vs an i7-2700k for gaming... the price difference isn't worth it. Just look at April's "Best gaming CPUs for the Money" on tomshardware.
I have said this many times and I will say it again. Series quality within a certain brand is more important than the brand. A good PSU doesn't always HAVE to be one from Seasonic. If the series of a certain PSU is manufactured by Seasonic or Super Flower, it will most likely be a good PSU. Reviews from jonnyguru.com are arguably the best PSU reviews on the internet. If he recommends it, you are guaranteed a quality unit. OCZ may be mostly bad, but the ZS series is one of the best series of PSUs.
Ah, I forgot about the Windows OS price factoring in. Do you need the price cut down? I think you can go with a Pro3 Gen3 motherboard (still ASRock) and save like $20 that way. Also, do you live by a microcenter? If so, then we can cut about $50 off.
Hold on... are you overclocking? I thought you weren't. Are you?
The nearest Microcenter is 3.5 hour drive one way. So not so easy to get to. As far as overclocking. After spending some time reading the forums it does not seem as difficult as I thought it would be. And I seem to get a bigger bang for my money.
I had to double check that it was the right build... that's seriously one of the builds I recommend to people (almost). If you have another $50 to spare, I'd go with a 7850, but apart from that, everything looks great! I don't factor in Win7 into the prices I suggest, so that's why I was surprised you went with a 560 Ti. Great choice, though!