Exactly my situation. I don't mind rooting for the Vikings as an NFC team, despite Favre. He's a big step up from their QBs of the last few years, though I fully expect him to throw a crucial pick as playoff time gets closer.
And I guess I root for some of the teams led by former Patriots too (KC, Denver, Atlanta, not Cleveland) when they're not affecting the Pats.
Texans: I gained respect for them when they took Mario Williams over Bush. Great move, and it's paid off for them. As long as they don't threaten the pats, i can route for them...in an underdog type of way. Also, that LB Ryans is great.
Steelers: I don't know how much i "like" the Steelers, but I respect them and their franchise...both in the present and past
Eagles: Have loved their defense over the past decade. Also had some class acts in Trotter, Dawkins, Westbrook, and to some extent Mcnabb. Kearse was fun to watch when he had that great year for them. I liked how Mcnabb used to make that passing game without a real WR threat (outside of the T.O. era)....very Brady of old-like
Denver: They're too good for me to like right now, but if they were to step it down a notch, I'd route for them every week. I love what McDaniels has done with that team, and i GREATLY respect him as a coach.
KC: Hard not to support Cassel, Vrabel, and Pioli. But it's a long way for that team.
If the Dolphins weren't in our division, and didn't have Joey Porter, I'd like them as a team.
Favorite player that is not a Patriot: Chad Ochocinco. Just follow his twitter and you'll agree with me. Dawkins is and always has been a great player and leader as well.
Hope they rot in hell: Colts, Jets (what a classless bunch they've turned into), Giants, Chargers (undisciplined and immature), and to a lesser extent, Cowboys (the epitome of under-achievers)