I don't think an HWC approved build would be a "useful" idea. There are many reasons for this but here's my main one:
Brand preference
Different people have loyalty/preference to different brands.
For instance, suppose you start off your build with the Corsair 800D. Right there, I won't buy that setup no matter what. I'm an Antec guy and can't be seen with a glorified P183 copycat of a case that the 800D is.
Or try suggesting an Intel SSD to a die-hard OCZ fan. It won't work!
HWC is an excellent hardware site but I believe their "core competency" is to write objective, informative and neutral reviews; not to put together a plan for your next PC build. You make your OWN plan based on reviews and other factors.
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Main: Intel 2600K @ 4.8GHz | Gigabyte P67A-UD7-B3 | 16GB Corsair DDR3-2000 | 2 x 240GB Corsair Force 3 in RAID1 | 2 x 4TB Hitachi 7K4000 | 3 x 2TB WD Caviar Black | 3WARE 9650SE | Antec 1200 | Seasonic XP-860 Platinum | 2GB GTX 670 | 2 x 27" Asus VE278Q | Auzentech Prelude | Win7 Pro 64-bit |