+1 for the many comments regarding the i7-930 + 2 "~$200" video card "obvious choice." However, as the authors have said, this was a 6 physical core showdown.
I would like to see the $1k and $2k pcs in the future have a SLI/Crossfire Vision/Eyefinity test, since many people will use that kind of setup for a pc in the $2k range. (And, some people do so in the $1k range. My personal gaming pc, a Core 2 Duo 6750 with a 5770, runs Eyefinity in some games.)
And, with the above said, the cost of monitors isn't a real issue for someone at this level if they are budget conscious. I am a big fan of the 16:10 1680x1050 resolution, and, as such, I use 22" monitors from the now defunct aspect ratio in my setup. (With an extra one already purchased for when I go with 3 monitors instead of 2.)
For Eyefinity, at least, all you need is 3 24" 1920x1080 monitors at ~$220 (Example:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236049 ) & a DVI to DVI adapter. The catch is the adapter. However, as of June of this year, AMD was "working actively with several manufacturers" to get them to produce a ~$30 single link DVI adapter instead of forcing people to buy a DVI-D adapter at $100. (Nvidia, of course, fixes this issue by requiring 2 cards and using the output from the 2nd card.)
Either way, I definitely would like to see such an inclusion including in the SBM articles. (And, from there, let people decide if they wish to pay the price premium for multiple monitors, even if the budget conscious price premium is lower than what many people say it is.)