Fliiping through my Games for Windows, I found that Vigor and Maingear were pretty highly rated at 7/10. Granted, these were dream machines, and you are building a more middle of the pack PC, but the reviews talk a lot about how the company builds.
Cyberpower got the worst review of the bunch, 4/10. Commodore and the HP Blackbird scored decent as well 7/10. Falcon-Northwest took the prize, but they don't offer much in terms of a cheaper version.
Vedit: elocity got a 5/10 in the reviews. AVA wasn't listed