You can save a few dollars with a PSU like this:
High Quality and more power than you need.
Newegg.com - SeaSonic X Series X650 Gold ((SS-650KM Active PFC F3)) 650W ATX12V V2.3/EPS 12V V2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply
If you plan on SLI in the future then this one is capable of SLI 570s and a OCd CPU without issue.
Newegg.com - SeaSonic X750 Gold 750W ATX12V V2.3/EPS 12V V2.91 SLI Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply
Yes, i am now a huge fan of Seasonic PSUs. Very well made.
I too agree, grab a SSD for the OS. I would at least get a 64-80GB and use it for just the OS and installed apps.
Put games and all other DATA on other drives. That will help a huge amount with the overall feel of things.