If your looking for a great excuse for having 2 towers but only one monitor tell them the 2nd (or any others you might have) are for Folding @home its a distributed computing project that uses your otherwise wasted cpu cycles to fold simulated proteins to help fight against cancer and other dieses. I have 3 full towers and a couple borged out boxes folding 24/7 and its a great excuse for having multiple towers running without monitors attached if your looking for one.