I can't believe most of you are just listing one or a few teams. Don't you know there is an established science to this?
It goes something like this, from strongest opposition to weakest opposition.
1. Division rivals are the worst. New England, Miami, and the NJ Jets are absolutely, positively NOT allowed to win.
2. Next comes teams that close friends, family, or coworkers are fans of. Why? Because I'm a miserable son of a B word, that's why. So for me, that means Chicago, Green Bay, and Miami (again) are ruled out.
3. Next comes teams that have beaten the Bills in the SB, so that rules out Dallas, Washington, and the NJ Giants. However, this is fading a bit with time. I still hate Dallas with a passion, but the Giants get a pass because of the fact that they bitchslapped New England twice.
4. And finally, the teams that have not yet won a SB because, as someone else pointed out, I don't want to see the Bills be the last team to have never won a SB. So that removes a whole slew of others. It includes Cincinnati, Cleveland, San Diego, Tennessee, Houston, Jacksonville, Carolina, Atlanta, Detroit, Minnesota, Philadelphia, Seattle, and Arizona. However, as mentioned, this is the group I oppose the least, and it wouldn't be that terrible if one of them won it. Of course, if the Bills ever do win a SB, this group is immediately absolved, and my life can return to normal.
So who does that leave, really?
Basically, it's any team that has already won a Super Bowl who isn't one of those teams mentioned above, which means: Baltimore, Pittsburgh, Kansas City, Denver, Oakland, Indianapolis, New Orleans, Tampa, San Francisco, or St. Louis. Not a big list, but again, I'm not categorically opposed to any of the teams in #4 above.
So...yeah. There you go. This is the mental illness I deal with on an annual basis.