Utah vs Pitt in the original BCS buster game, BYU vs KSU on New Years Day Cotton Bowl, BYU vs Miami in a 1990 regular season game are 2nd and 3rd and fourth. In that order. 2 minor bowl games - BYU vs Michigan 1984 & BYU vs SMU 1980 are probably next.

This Utah/Michigan game probably cracks the top alltime 3 games played inside the state from a national hype perspective. As far as importance goes, it is way down the list.