My two cents:
Gigabyte > ASUS as far as motherboards go.
Corei5/7 is good if you want lots of CPU power, but as far as gaming goes you're kind of burning money.
750W PSU would be fine but is probably a little overkill for a single card.
Samsung DVD drives are made out of cardboard.
Around what you're looking at I'd probably lean to a 955BE instead, use the money elsewhere. Good luck with the system though.
Edit: I've got a 150gb 10krpm raptor in my current setup and that's heaps for storage. They're fast but kind of noisy, faster and more reliable than RAID0 and cheaper than an SSD. I'd wait a few more months before getting an SSD.