I got a chance to get to Gates BBQ while in KC, and I LOVE their sauce! I don't suppose you have their recipe?
For our last night celebration we got to a place called Jack's Stack BBQ. A little spendy, but also good. I didn't have anything with sauce on it there, so I can't speak to their sauce. That being said, a couple of the folks in our party RAVED about the sauce, but even more so over their beans and cheesy corn bake. They referred to both of them as little bowls of heaven.
Good food!