I liked the Vikings when Fran played and the Purple People Eaters were dominant, Chuck Foreman, Sammy White, Ahmad Rashad who was Seahawk Property but never played a down and we got Carl Eller I beleive in a deal for.
Also was a big fan of the Raiders when Madden was coaching, any team with that much swagger that backed it up and still won regardless of penalties was something you had to watch. Talk about intimidating. Sadly the No Fun League made them mythical beast forever talked about and never again to be seen.
These days it's hard with teams not keeping players and coaches for very long, team identity changes like underware almost every season you see revamps of almost a dozen coaches now.
It would have to be a AFC team though, can't support a team in the NFC that could interfere with the Seahawks. Probably start off with the Raiders, being a old favorite and them still trying to figure out who and what they are post Al Davis it could be interesting.