the only thing I conceded on for now was the video card, opting for the Radeon 5870 instead of the 6970
Something to keep in mind. For very little more money over the 5870, you can get a 6950. Newegg lists a cheap 220 dollar Saphire 5870, but preferring the warranty of XFX their 5870 lists at 250 dollars. Their
reference 6950 lists at 290 dollars and Saphire has one at 280 dollars. XFX have other 6950's, but you might want the reference versions that have the fan on the right, not in the middle.
You might want this because the reference 6950 can be "unlocked" turning it into a full blown 6970 by following these instructions.
http://www.techpowerup.com/articles/overclocking/vidcard/159If you are not planning 2 video cards, then I might question the need for an 850 watt PSU. Perhaps some money could be freed up there.
So for around 280 bucks you can have a top of the line single GPU card and save 80 bucks or so. But yes, depending on the 5870 you are looking at, it can be more money.
Just FYI.