Quote from clearinghouse:
I've had success with VelocityMicro.com. I like VelocityMicro.com quite a bit, because their service was great and they gave me a good price back when i7 systems weren't even shipping at other retailers.
I went to these guys after Dell really disappointed me -- every single Dell box I've bought has had components burn out on me within 2 years, even the higher end business stuff. Only good thing about Dell is if you buy their business line, they give good customer support.
Newegg.com is good for buying pieces individually.
For brick and mortar, try Fry's Electronics (if there is one in your area.) I like TigerDirect less, but I buy parts from there once in a blue moon.