Have you tried any of the new McCormick Slow Cookers Seasoning mixes? I've only tried two so far, but they are pretty tasty! If you don't like your chili spicy, add 1-2 cans of tomato paste.
1 pkg McCormick Slow Cookers Chili Seasoning mix
2 lbs hamburger
2 (14 1/2 oz) cans diced tomatoes, undrained
2 (16 oz) cans kidney beans, drained and rinsed
1 (15 1/2 oz) can tomato sauce
1-2 (6 oz) cans tomato paste, optional
Brown the hamburger and drain. Place in crock pot, and add the remaining ingredients. Stir well and cover. Cook on LOW for 8 hours, or on HIGH for 4 hours. Stir well before serving.