Cleeve,
Do you use rebates in your selection of parts? Because PC&Powercooling is considered to be one of the best PSU brands out there.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341011
It's a PC&Powercooling 750W for $80. Not only will it save you $20 over the $100 corsair, but it's roomier for OCing power.
All the rest of the parts look solid.
I would give some consideration to X2 GTX260 core 216s in SLI for the people who don't like ATI. They can be found for $235 each. $470 total.
Just a thought.