Welcome to Flyertalk. This is a rather frequent topic in one form or another here. Most typically people who are considering changing programs. It would be useful if you could add a bit more information. Particularly what airport you typically fly out of, where you typically fly, how much you fly for work, how much you would be interested/willing to fly in addition, what to you want to do with the miles (exotic vacations, upgrade on business trips, etc). Given schedule cutbacks at some airports by some of the majors there are some places and flying patterns that greatly change ones perspective of how to go about this. Have fun.