Build looks pretty solid.
I've only got one suggestion to add in addition to those already listed.
You're motherboard is fine but won't support cross-firing, so you might want to think about upgrading to a board that will. However, if you're sure you won't be cross-firing don't bother.
Anyway something like this might do, if you want the option of cross-firing and can squeeze it out of your budget: ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard - Retail