I like to use cheap 6-man rotations in $80 MM OL with guys like Monty Stratton, Ray Caldwell, Bill Burns, Schoolboy Rowe, etc. You can usually bring a good one in for under $30 MM -- as low as $27 MM if you skip Stratton and Caldwell and really work at it.
I'm about to try a 9-man rotation with all 100-150 IP pitchers -- Elmer Steele, Art Nehf, Fred Toney, C.C. Sabathia, Cal Eldred and guys like that. I think it's costing me $33 MM, and then I have a $9 MM bullpen and a $37-$38 MM offense with two positions punted . I'll let you know how it turns out. Something tells me it won't be very good.