What I see here is a big waste of money... Scrap that case, you don't need that and there are limitations on overclocking that exceed the capabilities of that case (i.e. - it's not gonna help you that much).
There's over emphasis on the wrong parts. I'd say get a dual board that had a 64 bit PCI slot (at least one) so that you could get the maximum bursts from your U160 card, dual chip, scsi raid so that you could raid 2 of those cheetahs or Atlas 10k II's...
As for the graphics cards, i can't even keep up with them. That card is gonna cost you your left arm and will be outdated in 3 months not to mention half the price you paid for it.
As for the sound card, any card that begins with Sound Blaster is NOT top of the line. Don't get me wrong, it's a good card, and i even use em, but it's pretty standard stuff when it comes to sound.
I can't stress the hard drive enough, having a scsi primary drive will make your machine seem so much faster, i can't even comprehend a scsi raid with two atlas or cheetahs... especially on a system with such a strong base. You'd fly.