I go back and forth between building and buying pre-configured.

I would not suggest building a PC to everyone for the average end user it just does not make sense. Over tighten one darn screw and an RMA is in your future.

I built a kick ass screaming machine just last week. Picked up parts from New Egg and Micro-Centers but I would could have bought the exact same configuration case and all for only $200 more.

The most important thing about buying a pre-made machine is making sure you research the reviews of that website or manufacturer. There are more than a few fly by night companies out there.