Football is first and foremost for me, so Packers and Badgers football. Love the Brewers, always played baseball as a kid through high school. I remember going with my parents and their friends to Brewers games at County Stadium to watch Yount, Molitor, Oglivie, Cooper, Thomas, etc.
Sucked at basketball, usually put in to foul, and my junior year of high school knew I would practice all week just to sit the bench so became a stuntman for our cheer squad and still got to go to the basketball games and hang with friends. Tossing chicks in the air and getting a letter for it wasn't too shabby either. But aside from Badger basketball, I really lost interest in the NBA post-Jordan. But am definitely paying attention to the Bucks this season.
Weirdly, I didn't start really watching sports until college--I think since I played football and baseball in high school I just didn't want to pay attention to it AFTER I had been in practice all week and played games of my own. But when I got to college I started following the teams much more closely on TV. College was the first time I had more than 3 channels, so I also developed a love of the Atlanta Braves since they were always on TBS.
But for me, I would probably rate it Badger football, Packers, Brewers, Badger basketball, Bucks.