Here is one that I made with my first Butt. It is a modification of Weber's Tangy BBQ sauce and my wife and friends have loved it. If you try it and like it, great. If you try it and hate, no problem. If you don't try it, no problem either.
Start 2TB of unsalted butter over medium-high heat in a medium saucepan. Add 3TB of chopped onions and 1/2 TS of celery seed. Stir occassionally and after two minutes add 1 cup of ketchup, 1/2 cup of bourbon, 2TB each of lemon juice, granulated sugar, Cider Vinegar, and Worcestershire. 1TB of dry mustard, 1/4 TS each of garlic powder, cayenne, and chipotle chile powder. Reduce heat and simmer for 15 minutes.
Use a mesh cover if possible to reduce spatters. It will be pretty good straight out of the pan, but it is better after it has had time to cool in the fridge.