i would suggest you find a new custom shop!
unless you are a hobbiest then stay away from the 700/800 series
those wd drives only have 32meg cache rather than 64meg...
Raptor as an OS is fairly pointless if you want a real difference go SSD (and it needs to be a good one)
or stick with standard 7200 OS drive.
The I7 960 is really not worth the extra money. I would either go with a I7 930 stock or overclocked or an I7 970 6 core if you have the budget. The CPU's in between are really not worth the money considering what you can clock most 930's to these days.
The Western Digital 1TB 64 Meg cache drives are the ones to go for. The RE3's are a waste of money if your not building a raid and their warranty is the same as the new 1TB 64 Meg cache drives. Raptor drives are great in a large array but not really worth the money as single drives. SSD is definitely a better choice if you have the budget. Otherwise go with the 1TB drives for the OS as well.
doh i thought he posted 860 not 960....