perhaps have a look at this http://www.tomshardware.com/reviews/build-a-pc,2969.html (though, since you dont emphasize on GPU in the configurations you just presented, the couple of 6850s in this one seems unreasonable) i am pretty subjective in my choice of hardware, preferring intel to amd in CPU field and amd to nvidia in GPU, without really considering which is stronger (irrational, yep), so i'm not much of a help in advices. Good luck finding a good configuration.