Melissa:
Just a small point: Portland has one of the best Mass Transportation systems in the country. It really is great. There are many in your situation where just the working person uses the car and the student rides the light rail MAX line or the buss into Portland center.
TriMet: Public Transportation for the Portland, Oregon, Metro Area
There is almost no parking downtown, and what there is, is $$$.
Be sure to check out Student discount fares for TriMet.
Also, you should forget about the social / economic / cultural / racial stratification that is so common in the Mid-West with central cities and their suburbs. Portland ain't like that. Yes, there are suburbs, but living within the city limits is not the social / cultural put-down like so many large cities in the Mid-West that I am familiar with. My goal is to live with using only one tank of gas per month so I can use my car just to go shopping on the weekends. Many household don't even own a car in Portland. The Mass transit is that good. BTW: Portland city itself is very Liberal; Very Liberal. and it has almost no mosquitoes.
Just some other tid-bits of information.