Pitt - To me, the "best" is the place that will best provide you with the advantage necessary to land the residency of your choice. Pitt has a reputation that far outdoes both UM's and Jeff in clinical (great affiliated hospitals) and research (like top 5 or 10 in NIH funding). It's rep has also been rising in the last 10 years, this is a good trend. Great school to be accepted to, Congrats.
Case - Wonderful affiliated hospitals and good reputation. If you are 100% sure about Cardio by any chance, then it's a tough place to beat. Also, solid in research.
Jefferson - Yes, #3 is Jeff to me. This place is a diamond in the rough. (and by rough I mean Philadelphia) Jefferson has many solid clinical programs and their ortho dept is tops. They also have a great research foundation that many overlook. FYI, the most commonly used recombinant protein used for any treatment was cloned there (EPO). Also, they are building a lot of facilities quickly. Do not overlook Jeff if you'd like to live in a larger city.
Universtiy of Miami - Great research. Not so sure about clinical. Also, how is your Spanish? If you have an interest in working with latino patient populations, which many people do, then Miami could definitely be your top choice. Personally, Miami sounds intriguing, until you really think about living in Miami FL for quite some time, year round.
University of Maryland - Really don't know much about Maryland. Doesn't mean it's very inferior, just means I don't know what they have going for them other than the fact that it is probably a solid allopathic med school in the US, meaning it's probably a great place to train.
Really man, you can't go wrong. Congratulations on a bright future.