Which Vendors Do You Trust For PC Parts?

CaryTheSane writes "After six years, it's finally time for my old Pentium 4 to retire to web browsing duties, and I want a new gaming PC. I'd like to build my own this time, and I've scoped out most of the parts I want for a moderately high-end system. Which online vendors have you used before that you trust for parts? I've dealt with NewEgg, and I like them, but I live in Tennessee, a state in which they have a presence. Unfortunately, this means they have to hit me up for 9.5% sales tax. That really eats into my system build budget, so I'm looking for alternatives. I'd like to use the fewest number of vendors (preferably only one), so that all the parts arrive at the same time and I don't have one part's 30-day return policy run out while I'm waiting for parts from another vendor to show up. So, which reliable and economical parts vendors do you recommend?" Conversely, are there any you'd recommend avoiding?