SM and BP have some great rubs.
The Sweet Money rub goes real good on any pork.
The best flavor I've had in butts is to use Sweet Money Rub, Sweet Seduction and Pecan rub. Then after the pork's done I grind up some of the Spicy Apple Rub and sprinkle it over the pork as a finishing dust. This was given to by big brother smoke and it's afarkinmazing!!!
If you go commerical, consider Dizzy Pig