I'm not really sure about the motherboard (Like I said, I'm still learning about this Core 2 Duo stuff). It may be good, but it sure is cheap, and usually lesser money = lesser quality, usually. But anyway, everything else looks pretty good. I once again really like the choice of GPU there. The 7900GTO is like a highly overclocked core version of the 7900GT: almost 1.5 times as high, plus it's got 512MB of GDDR3 memory. Everything else is pretty much the same, except for the cooling fan. No comment on the PSU; I really don't know how good it is, but the 680W will definitely be enough power to SLI those GTOs, if you decide to do so. And of course, the processor is excellent. The HDD looks to be good, and nearly all the DVD drives look the same to me, so I'm no help there. All you probably will need for the inside of the case is some SATA cables, and it looks like you're set. That's gonna be a really good computer.
Once again, good luck with your build when you decide to do so. I hope I've been a little bit of help.
edit: aah, yeah. forgot the SATA cables usually come with the boards.