Urmm a decent gaming PC would probably be around $500-$600. Right now I selected some pretty good parts, an ivy bridge core i3, 400w PSU which will probably have to be update to a 430/450w, mobo, optical drive, 8gb memory, coolermaster case, total is $441. There is a $10 code on the case when u can enter, all that's missing is Graphics card, I'd recommend a GTX 550ti which is $119 and a keyboard/mouse and windows if u want to use windows. I will post Ll the specs tomorrow since its 2am right now.