Pretty nice specs u came up with.
And well, 9600GT in SLI setup should beat a 9800GTX. Instead of buying a 8800GTS for ~17-18.5K, it would be wise to invest in two 9600GTs!
One more thing, go for WD HDD if possible. Possibly, ones with 16MB cache, like others have suggested.
Regarding PSU, i thought CM Real Power 550W should be appropriate. And, instead of AS5, go with MX-II. AS5 is gr8 for GPUs. U120E is a good choice.
So, when are you going to buy the rig?