A case is a case as long as you have decent air circulation. My buddy had a server in an old beat up Thermaltake case that we fashioned a plexiglass side for that was held on by zippy ties. It worked like a champ. All a case has to do is hold your stuff in place. The only thing you want to make sure is that the motherboard mounts well, but with the ATX and Micro-ATX standards there usually is no issues.