Getting a new MacBook for College?

So I’m an incoming college student looking for a new MacBook to go to school with.

My thoughts are leading me toward a MacBook Pro, and I don’t have the money to get the one with Retina Display. I would like to either get a 13 or 15 inch Pro, but my real question is in the type. Should I go with a 2.5 ghz or 2.9 ghz model of whichever screen size? How much will this effect the speed of the computer, and will it last four years?

I’ll be using the computer for mostly college related things (schoolwork, paper, notes, etc.) along with syncing my iPhone to it for music (About 20 GB of music) and maybe some video editing.

Thoughts? Thank You.