First of all, congrats on all of your acceptances.
I've done the IMS program at drexel, but I know a bit about the DPMS program as some DPMS students are in my classes. (I have a bunch of posts about IMS and MSP under the Drexel IMS thread, if you're interested)
You'd be rather foolish not to do DPMS in my opinion. It's one year, and you're guaranteed a spot in the med school.
Here's how the whole thing works...
With DPMS, once you're in the program you take a hybrid curriculum of IMS and MSP classes plus tons of MCAT practice for a total of 14 credits the first semester and 10 credits second semester...not too strenuous at all (considering IMS/MSP has upwards of 21 credits/semester). You take the MCAT in april and as long as you maintian a 3.0 average in your classes and get a 23 on the MCAT you're in medical school at drexel. (The guaranteed interview is for IMS students that get a B or better in every class in the IMS curriculum...not the same as the DPMS gauranteed seat) To me this is a no brainer...you're essentially in med school now as long as you get a 23 on the MCAT...which most people are able to do with the 9 or so months you are given to prepare for it.
As for MCP being an unstable institution...that
was true, but now that it is affiliated with drexel, it will be stable in the future as most of its issues with solvency have been cleared up (the issues with MCP hospital closing have a lot more to do with Tenet's - the company that owns the hospital - financial problems than the Med School's...it just sucks because some med students rotate through there. And for the record, it's looking more and more like it is going to stay open). You might get into a "better" school if you go through the BU program...but it's way more expensive, twice as long and arduous of a task and either way you end up with an MD degree. Drexel is a very progressive and solid med school with better than average residency placements.
I am hesitant to say what I'm about to say for a number of reasons, but I feel I would be remissed if I didn't inform you of the ineluctable tension that exists between
some MSP/IMS students and
some DPMS students. It all revolves around that ubiquitous pre-med ultra-competitiveness, and the fact that DPMS students get into the med school with a 23 MCAT and barely a B average in what is a rather watered down curriculum, while some IMS/MSP students with better grades, almost twice the course load, and MCAT scores some 4-5 points higher get rejected or have to sweat out the summer on a waitlist. It really doesn't amount to much I suppose...just some behind the back bickering (that I happen to hear a lot of because i'm in IMS) - all in all rather childish, but I felt I would let ya know. I certainly wouldn't let it keep you from coming here...It's a great program, and I can't reiterate enough that you have a guaranteed seat in med school.
Check out this site if you haven't already...
http://www.drexel.edu/med/ims/dpms.asp
Good Luck, and again Congrats.