1.) I'd certainly not go with one of the "Extreme" models from Intel, its simply not worth the price. Instead I'd suggest either the Q6600 or Q6700 depending on if you're willing to overclock or not.
Depends on how easily those processors clock up to 1333Mhz fsb I suppose.
2.) Going with DDR2 would be my suggestion as well. It simply doesn't make any sense to go with DDR3 as it offers no performance enhancements but a very substantial increase in price. In fact, since you seem to be very concerned about editing performance, I'd suggest going for 4GB of DDR2 for less than 2GB of DDR3. While the bus line up "issue" might annoy you, in reality its a complete non-issue.
The memory isn't tied directly to the FSB?
3.) Personally I think I'd go with the two times 1TB drives. No real reason other than better value and the three drivers offer nothing over the two 1TB drives.
That'd be $720 worth for 2TB vs 3 500GB drives for $360. I could get 2TB there for $480.
I was just considering the expansion ability when looking at the single TB drives. 4 slots full for 2TB vs 2 slots for 2TB.
4.) I'd highly recommend a higher quality PSU. Anecdotal or not, I simply don't put much faith in Antec power supplies anymore, especially when you're looking at a very high end system. SeaSonic and SilverStone is where I look these days.
When I took a look at the box at Best Buy, it says rated for Nvidia SLI, so I figured that the PSU was high quality. That and Antec cases are pretty good. hehe. It also has a 5yr replacement warranty.
The reviews on it seem to be favorable. http://www.google.com/search?q=ante...avclient-ff&ie=UTF-8&rlz=1B3GGGL_enUS224US224