Great question sir. In my mind there are at most two tier 1 rivals for any team. With Wyo and CU there is vitriole. No problem selling out either team in our house (you'll see next year). Family members that claim the opponent as an alma mater don't speak for weeks because of that FB game. As you know I don't personally care as much about the CU rivalry as most of our fan base for a number of reasons, but if I'm speaking for The RAMS I get that it's extremely important to most and the most important to some. With AFA, it's intense but not at the same level. It's not like the Sonny/Fischer days anymore. Maybe that changes when CU goes away? The CU rivalry is tough for me because it takes two to tangle, and the game's just not as important to them. The series is forced by the legislature, and they have tried multiple times to walk away from it.
In the new MWC CSU has a strong rivalry developing with USU and obviously desires enough results to make that occur with BSU. Too much history with AFA to not consider it a rivalry (BTW that RAM/Falcon trophy looks like it was made in woodshop but that's beside the point), but I just don't see the fanbases emotion for that game at the same level as the two I listed as tier one.
Minnesota was a running board joke for a while.