After owning a gas guzzling Audi A6, I'd like to purchase a Hybrid. I just have a few questions.

I'm a student therefore I am looking for a budget car. During half the year I drive around 60+ miles a day, and I know these are ideal cars for high miles. However, I was wondering if these cars have long lives. I'm looking at one for $8,000 that has 175,000 miles on it. Do high miles matter as much on a Prius as compared to other cars? When problems arise, does it cost a lot to fix them as compared to other cars? Thank you for helping me on my decision!