Get one that is two stage, and CAST IRON. I have a portercable from Tool King, and it is the same model they sold as Sears Brand, it works good, but after a year or two, it needed some head gaskets and the head bolts wouldn't tighten because of the aluminum.

Cast IRON!

Check Tool King down here in Lakewood, good selection of porter cable, dewalt and a couple others I believe.