Well if you still don't want to build your own Legos, you can get custom built ones. There's the top of the line, Falcon Northwest. AVADirect, Puget Systems, Maingear, and to a lesser extent Alienware. If you reconsidered you can check out PCPartPicker to assemble a list or Newegg, Amazon etc. Legos are fun. And easy. Just don't stop on one in the dark.
I think I might go with Alienware, but any other suggestions? My dad finally agreed to order this week so I can get everything by the time Ian comes