get the i7 920 instead of the i7 975, with an aftermarket heatsink the 920 is just as good.
skip the Velociraptor and get a SSD
The regular EVGA X58 will perform as good as the Classified unless your going to use a Phase-Change, Dry Ice or Liquid Nitrogen. And then the standard EVGA X58 is still a contender, I got up to 4.949GHz
12GB of ram isn't needed and it can even lower your performance. 12GB will stress the memory controller, I've seen more than 1 system with 12GB that could not run the memory at it's rated spec's.
The Killer NIC card is a joke, don't waste your money.
1000 watt power supply is way more than you need, but with power supplies more is always better IMHO.
(2) 4890 vid cards? You have all this high-end gear listed, why would you pick those? ATI will have a new card out in a few weeks that will make the 4890 look weaker than it already is. If you can't wait then you should go with a pair of GTX 285's.