There's no reason to buy a Blu-ray RW drive if you're not going to be, you know, writing Blu-ray discs.
If money is truly no object, you might consider using an SSD as the boot drive rather than the spinpoints. That will increase boot time and load time for games, though it won't really have any other effect on performance. It will be noticeably faster than any RAID 0 configuration though.
Currently, spinpoints are purported to perform better than the velociraptors, though I haven't read the review myself. I know MadAdmiral and others have linked it in multiple threads, though.
The i7-950 is probably unnecessary. Most games these days are limited by the graphics cards, not by the processor. Not that you shouldn't go with it if you want to, but it's overkill for gaming.
Make sure that the motherboard isn't going to drop the speed for the PCI lanes with the addition of that soundcard. In general these days, on-board sound is fine for all but the most discerning listeners.
And are you sure you want 5850s? Again, assuming price is no object, 2x 5870s would be better, or a single 5970.