At the very least, David, you should sign up with Maritz, Market Force, Stericycle/Corporate Research, Bare, and Intelli-shop. They have shops pretty much everywhere, and you'll be exposed to a variety of scheduling styles and editing styles. Branch out from there based on comments you reach here until you're finding more shops than you have time to do ... then keep adding more shops. The more experience you get with a company, the more likely they will be to offer you better paying shops, bonuses, first crack at the good stuff, etc.
There is a link at the bottom of this page with information about a couple hundred or more companies. And sign up for the magazine -- companies get reviewed there and different kinds of shops are reviewed to help you find stuff you might enjoy doing.
Time to build a bigger bridge.