Don’t buy a crappy eMachine or a Dell.
Do build your own computer. Or at least choose a prebuilt model that has flexible and upgradeable components. Newegg.com has a small selection of barebones machines but they look kind of lame. Just buy a good case, a decent motherboard, and a power supply with at least 30 amps on the +12V rail. The 12V amps are more important than peak wattage.
Aaron Bronow 