Wow a lot of those things are the identical things I have on my computer. I also agree on Corsair since it's never failed me yet *knock on wood*. I have the same chip, video card and memory (well same company) so that's kinda eerie.
As for MB, this is the one I got:
http://www.newegg.com/Product/Product.a ... 6813131153
To be honest, I don't remember why. I remember thinking the SLI stuff sounded cool (even though I'll never use it) and the fact it had 16x PCI Express, but beyond that I don't remember. I'm not too familiar on MBs in terms of the actual stuff like 775 650i and so forth. I do however, have a good experience with nVidia based platforms so *shrug*.
As for the video card, as I said, I have the identical card and although it's a bit overkill (and it is literally a brick), I wanted to build something where I could be good for a few years. Also there's *no reason* not to get a DX10 capable card right now. They're cheap enough now and DX9 is well..a generation back (even though technically DX9 is the one folks are using now...trust me DX10 will be adopted so I'd rather be ready).
Edit: I didn't read the next post and yeah a GT is fine too. My only argument is that you should definitely get an 8X00 series card since they're all DX10 compatible.
As for HDs, I agree on waiting on Solid State. It's WAY too expensive right now to justify. Sure it's hella fast, but well..I'd rather have $800 in my pocket now and wait the whopping 20 seconds it takes to boot then saving a few seconds.
Uhm...I think that's it.