I recommend using Resellerratings.com to evaluate computer sellers.
Here are some ratings for the sellers mentioned in this thread:
I recommend looking for retailers with ratings above 9.0, based on at least 20 reviews in the last six months. A rating of 1.20 is not good.
Tiger Direct 8.50 Emachines 3.75 Circuit City 1.20
Offhand, some that I see there that I suspect are worth further consideration are: Champaign, Monarch, Essential, KC Computers, Outside Loop, Puget, and Envision.
Over the years, the top retail sellers change, but by picking the current leaders at Resellerratings.com, I've had consistently excellent results.
By directly contacting some of these retailers, on the phone or via their web page custom system builders, they can help step you through selecting just the right stuff to meet your needs, better than we can here at FR, and get you a solid box, with no hastle, for an excellent price, that matches your needs well.
I am looking at a computer seller called internetishop. They are a reseller for the Hugebee group. The prices seem excellent, but they have no rating on Reseller ratings at all. I have a friend who bought their last computer there with good result. Have you heard of them?
Their website is www.internetishop.com. They purchased the Hugebee group and now resell their products.
http://www.c-computer.com/systems/orange/