Awsome rig but.....
In a totally personal oppinion I'd recommend this
Thermaltake Silent PurePower, 420W ATX power supply.UL, CSA, TUV, CE Approved. Intel Pentium 4 Compliant
http://www.newegg.com/app/ViewProduc...153-006&depa=0
(plus it's cheaper because of free shipping)
If you are planning on staying at stock speeds with everything, go ahead and stay with the X800Pro, But if you have any interest in overclocking and getting the best bang for your buck I'd recommend looking at a 6800GT. It uses the exact same GPU and memory as a 6800 Ultra, only being clocked 50Mhz slower. Plus it isn't crippled like x800pro which has 4 less pipelines than the X800XT.
Also, is there a reason why you are not going for a DVDRW drive? The new technology Dual Layer drives can be had for around $80 and would be a better investment than that combo drive.