Thanks for the responses guys. I want to know more about the power supply that comes with the case I originally posted. I know they are not good quality but I thought I could just change it when it dies. When it goes will it damage my hardware? Also I wanted to know if you guys had any experiences with microATX towers and such. I needed something small for easy transport and this looked great. But my fear was that it wouldn't bee able to fit a regular sized graphics card. Any experiences?
Apevia PSU-shaped objects are some of the worst junk made, and yes they can fry your other parts when they croak. Furthermore, the one Apevia case I ever bought was so poorly made (great design, but executed horribly) that I won't risk another.
Otherwise, the only thing I'd change in Proximon's build is the case. This Rosewill is smaller (my wife took one in her luggage to her brother in El Salvador a couple years ago) and the fan is decent and quiet: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
There's a similar one with cheaper shipping, but the front panel on it is a little funky; this one is cleaner.
For older Steam games, a HD6770 may be all the GPU he needs. They're $110-$130. I'm not sure I'd trust the brand of the cheapest ones (Powercolor), but at the higher price you're getting close to the more powerful HD6850.