I live off campus from my dental school. I drive about 10 minutes to a parking spot I pay for monthly, and then walk 10 minutes to class. If you like living alone and keeping things in your place the way you want them, I think this is the way to go. I could have lived alone on campus, but the difference in rent living off campus is more than $500 a month. I get my own washer and dryer as well. The cost difference is huge and adds up over your time in school.
Commuting 20-30 minutes to class is no big deal. Just make sure to schedule your time well and manage your responsibilities. I don't even do that very well as of late, yet I've still survived school since I'm not trying to get straight A's. I'd say live farther away for less cost if I were you.