Some awesome possibilities out there...all those great deadball seasons with killer pitching staffs....you could put a Ruth Red Sox team from the teens in, or a Ruth Yankees team from the 20s-30s...some seasons he's too pricey to roster at 80M, but not all (look at 1915, 1922, 1932...)
How about those great Cardinals teams of the 40s? Lots of good possibilities there, and some have done well in previous iterations.
What about a Brooklyn-New York combo from the 40s or 50s? Or one of the great Braves teams from the 90s?
The beauty of this league is that at 80M, NO team can use ALL of their stars, and just about EVERY team can put a competitive squad on the field.