If you are serious consider getting some Asic miners or even Used FPGA miners, rackmounting them is rather trivial and the rest of the servers will thank you for saving them from an early death.
That is what I would like to do with the BTC I raise from an offering on bitfunder. I would like to buy some of the ASICMINER blades as well as placing orders with Butterfly Labs. Then pay out the mined BTC as dividends to shareholders and keep 5%-10% for myself. Once I show that it is making money then my boss will invest some of the company profits into shares to collect BTC dividends.