I'm a fairly technical person, but nevertheless the idea of building my own PC is still a little daunting, so I'm trying to figure out how much of a loss I'd be taking by buying a pre-made computer, and what a good configuration and manufacturer would be. I'm looking in the $800-$1000 range, and I'm playing mostly games like Starcraft 2, Civilization V, Team Fortress 2, and Fallout: New Vegas (when it comes out, of course).
These are examples of pre-built computers I'm considering:
I'd really appreciate some feedback on which manufacturer to trust, how decent these configurations are, and how much of a loss I'm taking by not building it myself (I already have a monitor and mouse and Windows, but I need a keyboard as I'm currently using my laptop for gaming). Thanks!