Take a look at some of the new systems with the Intel Sandy bridge chip. They are very powerful and more efficient than older systems. Read up on some forums where they compare performance, power usage and heat production from these CPUs to the older PC CPUs.

http://www.newegg.com/Product/Produc...82E16819115070
http://www.newegg.com/Product/Produc...82E16819115072