I buy a whole tenderloin and trim it myself. The butchers always throw too much away because it takes more time to cut out all those small pieces that are stuck to, and imbedded in the fat and gristle. Those little bits add up to a bunch of great chili meat. The rest of the tenderloin goes into filets and chunks for shish-ka-bob.
Since I started the Paleo diet lately, and have been losing weight without hunger, reduced my blood pressure and cured a case of chronic "intestinal distress" (diarrhea) I have discontinued using beans. I have always used and liked beans in my chili, but I find I like it better without them.
Basically beef of some variety, onions, tomatoes (diced and paste), various types of ground chili powder, plus a couple of whole chili peppers chopped up (poblano, cayenne or whatever I have). I also mix in several seasonings, but I never know what I am going to use until I finish, but it will include some amounts of cumin, tumeric, oregano, garlic and anything else that seems good at the time. I don't spend too much time thinking about it or measuring it, so it makes it easy.
Sometimes, I will chop some mushrooms or celery, but like my chili to be mainly meat, tomatoes and chili peppers. If you have a few cans of Rotel it makes it easier to get the spices and heat right.
If it weren't for this darned global warming I would be cooking a pot today, but it is in the mid 70s here and I like chili in cold weather.