i was going to reccomend overclockers.co.uk, but then realised you're in US.
the only advice i can give, is DONT get a DELL!
the pretty colours may be tempting, but bundled processes and services slow down your' machine, and quality of less important components such as psu and RAM are poor. especially ram, as most commercial computer companies seem to be more interesting in boasting how many GB's rather than how good/fast the ram is. sorry i probably didn't help xD