A few ideas:
1. NASCAR manager game would be awesome. There was an old game called F1 manager, which was decent, but a NASCAR mangement game would be much better.
2. A career Football Sim with level of detail that Champ Man has.
3. OOTP 7, which I believe will have the level of detail that Champ Man has.
4. A sports role-playing game. A game where you either begin as a high-school coach and can grow till you become a Major league coach, or were you begin as a highschool player and can grow to the professional level.