The other thing to try, if you get into it, is buying steak and mincing it yourself. That way you can select the cuts you want to give you the fat ratio you prefer. Chuck steak, if you can get it, is supposed to be a good cut for burgers.
My local butcher doesn't put black pepper in his burgers. He uses Scotch Bonnet peppers and calls them "Dragon Slayer Burgers" . They are made with dry aged beef and they taste awesome .