KeithDust, Costco and Staples chains - these are bargain stores.
Costco is known mostly for its consumer-oriented food, clothing and small appliance sales; they do get consumer electronics and computers, generally surplus lots and low-cost made to order. (I am not thrilled to see Athlon64 in a Costco offering, it cheapens the brand.) The stores are warehouse-style, no customer service.
Staples is an office supply store that specializes in paper goods, filing, office furniture and electronics (cell phones, faxes, computers). They target small businesses as their primary customers. This is a more respectible outlet and does offer some sales help to customers, on par with chain electronics stores. However, premium product is not to be found here either.
I would avoid Northgate brand based on the outlets they are targetting - they have to really cut cost on components. Sounds like they are filling the niche that eMachines abandoned when they decided to actually make computers that work.