When I built my first rig, I chose to use a full tower case. It was a COOLER MASTER full tower computer case. I was very happy, as it had sufficient room for everything, and was great for a first timer, but now that I am more experienced, I would have to recommend builders use mid tower computer cases, even the new micro cases for their builds. They are lighter and can be moved to and from LAN events and even around the house easier, which is a huge bonus. They may be smaller, and harder to build due to less room, but you'll thank me for the extra portability and desktop space later. My most recent PC uses a KillerRigs M@x case, the smallest around, and I couldn't be happier! Be smart and remember, in the technology world, smaller is better.