Motherboard seems solid from a few reviews I've read. It's also a great overclocker from what I heard. You should be able to bring that Quad Core to 3.0GHz and beyond
As for the power supply, isn't that over killing it? I mean, a 700W would be more than enough, unless if you plan on getting 4 HDs in there in the future, with two GPUs. Then again, 1KW, hell, that's way too much.
Why the two HDs, are we looking at a RAID setup? If so, which type?
Last thing, I really think you should be getting more RAM. RAM doesn't cost much these days, and you'll be regretting later that you didn't buy more. It's probably the part you've overlooked in your build, imho.
Anyhow, that's my opinion.