Tier 1 - Toronto Blue Jays, Peterborough Petes
Tier 2 - Toronto Maple Leafs (they fall a tier because for the most part, I ####### hate Leafs fans)
Tier 3 - Toronto Raptors
Tier 5 - Sheffield Wednesday, Buffalo Bills
I really haven't watched NFL in years and when I did, it was more about my fantasy players than any one team but lately I've been considering bandwagoning the Bills - they're by far the closest team to me. My wife's family is from Sheffield and her brothers follow the Jays closely when they're good, so I kind of quid pro quo with Wednesday.
Beyond that, I cheer for ex-Petes players on their NHL teams and that's put me on some bandwagons from time to time (i.e. Canes with both Staal brothers). I would probably choose a concert over a regular season game of any of these teams.