I'm new here and was just passing through casually when I noticed that you had IU in your list and thought I would mention that I was an IUB undergrad. I am not going MD/PhD but was admitted to MD and DO programs. I obviously have no experience with IUPUI or Mich State but IUB is fantastic for research. You will need to get in with a professor as early as possible though and some are specifically seeking freshmen/sophomores so they have multiple years to build a working relationship and have long term help on projects. In the end, though, pressing for early contact and identification of a mentor can lead to some fantastic outcomes.
The only bump in the road I see for you is that you said "University Division." While this doesn't preclude you from doing research, it is easier if you are a direct admit to biology (or biochem or whatever). I was a direct admit to biology and therefore had access to some more advanced courses slightly earlier than some of my University Division classmates (in some cases - please note this was not true in every instance). I also had the benefit of coming in with a large amount of AP and dual credit courses as well as test out credit which allowed me to move up faster. I chose to diversify and picked up a some minors but you could easily translate those advancements into advanced courses, independent study, and lab credits. I was direct admit to both IUPUI and MSU.
You can do research anywhere and can get into medical school from most any undergraduate institution that has science courses. The bigger factor is you and the effort you put in. Balance all the factors that everyone tells you - grades being the biggest thing (even keel, low numbers of B/B- or lower, some challenging courses, some diversification into arts or writing or other topics) with smatterings of volunteering and leadership and a hefty dose of medical exposure. The biggest challenge for you will be adding some meaningful research experience to the mix so that you can confidently talk about the work you did and the fields that interest you during your applications.
While I do not want to discourage you, I would also ask you to consider your reasons for wanting to do the MD/PhD and discuss them with someone who has a Phd and someone who has an MD or DO so that you can gain some perspective. What fields of research are you interested in at this time? Would you consider MD only if you were unable to gain an Md/PhD spot (there are less MD/PhD spots, making competition fierce)?
From the perspective of someone who has been in your position, just recognize that you are talking about Big10 institutions so the quality is fairly equal for most subjects. You aren't really deciding between Stanford and community college here - it is apples and apples, not apples and oranges. Go to the one that makes you the happiest. You can find the research experience when you get there.