My favorite, hands down, is Plowboys Yardbird. IMO, though, there are lots of rubs that are spectacular. Try a bunch of the recommended ones and you'll walk away very happy and very knowledgeable in the end.
Yoder YS640 / UDS / Mini WSM
Hackers -n- Hogs Competition BBQ Team
Harrisonville/Lee's Summit, Missouri
Grip it. Rip it. Let the big hog eat!