Hello. Recently I've been trying to decide on a nice relatively cheap case for the build that I want. Honestly I really could care less about looks as i'm more of a functionality person. Looking for something preferably around $20-40 (less is always better) that has decent air flow and isn't ridiculously huge. This is roughly the build I have so far: http://pcpartpicker.com/p/mhHC4D (granted everything is subject to change). Any suggestions?