How'd I buy new PC?

what's a good place to buy pre-built or custom-built PCs? I'd build one myself but I'm a big fucking n00b and dangerously prone to static electricity.

I'm looking to spend around $1200 for a new PC (to run Vista but mostly b\c of DX10). My only requirements for the new computer is to have 2GB of RAM and a Dual Core Duo 2 CPU (preferably greater than E6400). However, it seems I can't find any PC from retail or the usual online places (DELL, HP) with a CPU better than Core Duo 2 E6400 (looking for atleast e6600). Am I overdoing it with the CPU?

"but nobody does it because macs suck
  
   I used to crunch numbers for a distributed computing project. There was a Mac team too and when a new faster Mac came out they all bought one.
   Many cries of "hawt or hawtest, fastest computer evah?" The Mac team remained near last place as all the Windows boxen continued to increase their leads.
   Macfags are great fun to mock.