I actually bought a computer from CyberPower a couple years ago.
Looking back at that purchase, I can say it was pretty good, especially considering they didn't skimp out on the parts. (A very nice Abit motherboard, a then-popular Thermaltake heatsink, and a slightly modified chenming case come to mind (chenming is used by antec, among other brands)). Their customer service back then was really nice too. I don't know about now, but if they have even a bit of that, I'd definitely recommend them over Tigerdirect.