Looks like a sweet system. I did not check on memory compatibility since I assume you already have, but the rest should work fine.
I see you went with a top of the line PSU which is good. That size will be more than enough for your single card, but you might consider moving up to the 750w if you plan to add a second later and maybe even 850w if you expect to do much overclocking on the cards and CPU. Its normall best to plan for a system that operates at about 70-80% of the PSU capacity to allow room for misc. upgrades and normal (but slight) decreases in output over time
This is my first time building a computer so I wanted to make sure that all the parts are good and compatible with one another. I've done a lot of looking around so I hope there aren't too many problems with my components.