You should get the intel i5 2500k. There isn't much difference between the intel i5 2500k and intel i7 2600k. If you want a gaming PC, get the 2500k. Imo, it's not worth the extra $100. You can use that extra $100 on the getting the GTX 580. There are GTX 580 for around $450.
RAM's crappy, which CPU, mobo ain't the best, I'd prefer a raid setup or a SSD, the case is just a flashy Antec, not that good tbh, no need for an extra audio card unless you're an audiophile or in need of an integrated amp.