I had the exact same decision and I chose DMU. The price tag for CCOM was just too much, paired with cost of living out there. The place I am renting now is a 2 bed/1.5 bath with great amenities and I'm paying what I would be for a 600 sq ft 1 bedroom around CCOM. I'm originally from about 15 min from the campus and my family is there but it just isn't worth the extra $$$ to me. Yes there are some great rotation sites within Chicago, but you also have to realize you aren't in the city and traffic can be a huge pain. Both CCOM and DMU are established schools with great reputations, and can both get you where you need to go. In my case, I plan on scheduling a few rotations in the Chicagoland area anyway, so the rotations around Chicago aspect was negligible. Also, the interview day for DMU blew CCOMs out of the water in my opinion. At CCOM we just sat in a conference room for 3 hours during the interview, while at DMU there was more things to do and you got a better feel of the overall vibe of the campus since you aren't held in a seperate room. The vibe was just better for me out at DMU, maybe because I'm a nontraditional student, and CCOM just seemed more 'gunner-y' to me. Also CCOM has lectures that aren't recorded (or at least theyre working on getting them all recorded), which in my opinion is a huge waste of time. Take everything I said here with a grain of salt, as these are just my opinions, and do not reflect in any way another person's judgement.
TLDR; Basically CCOM is wayyyyyy too much $$$ for not enough of a boost in overall career prep, DMU has a great, collaborative atmosphere, great faculty and has recorded lectures (CCOM doesn't have all of them). They both have a 5+ year run of 100% match and great board averages so either way you can't go wrong, but that money will bite you in the butt later on in life, I'll go ahead and pass on an extra $30,000 a year.