hey there,
i'm a mt. carmel IM graduate from last year. OSU is best if you want to go for competitive fellowships; just remember, they work you like a dog - but if you want cards or something, that is the best place to be in columbus.
Riverside if you want to go for not so competitive fellowships. Mt. Carmel if you want to be a hospitalist or internist with some interest in a not so competitive fellowship. that about sums it up. PM me if you have specific questions.
mt carmel was an awesome place for residency for me. its very friendly, the nurses are terrific, the ICU attendings teach you SO well (i can intubate in my dreams), conferences are very good. i think riverside is also considered very good.