Great to hear, Don! That's why I never eat at local BBQ restaurants anymore!
My Sam's, in Fayetteville AR, has very good-quality meat. Brisket is mostly Choice, but occasionally Prime. Other beef is available in Choice or Prime. Wally World, on the other hand, sucks. Their brisket is never better than Select, which is way too lean (and a lot bigger tolerance to meet that grade). I made the mistake of trying it one time...never again!
I would think if you were going to add honey to your binder, you wouldn't need the mustard. Mustard is used because it doesn't add any flavor, and holds the rub on. Honey will probably add some flavor, and should make the rub stick great!