I'm not getting this. From what you (op) says, sounds like you 'need' two bikes: a good one for summer use, if you are indeed riding 80 miles at times, and a beater/dispensable bike for college use.

Unless you can take a bike 'inside' on-campus, anything more than a decent-but-disposable bike for a 15 minute trip to/from campus seems to me silly -- a pointless waste of money. Anything in the 1500+ price range is going to be a theft magnet if left locked up outside; no way around that whatever you may think about campus security etc. That's leaving aside the question of incidental damage.

But hey ... if you can afford to take the loss, go for it.