Upgrading to MBP??

Hey I have a white core duo 2.0 GHz macbook that I bought about 7 months ago. At the time I really didnt feel like spending the money to get the MBP because I didnt realize some of the differences. Now I really wish I would have invested in one, a few of my mac friends here at my college have them so I have had some experience using them.

What I was wondering is does apple have any type of buy back/ upgrade type of service?

I am really considering upgrading. I like the bigger screen for one because i usually have more than one thing going on at once. Also I am in college and I usually stay uplate to do work, this is bad because my roommate has a different schedual than I so I am sitting in the dark for most of the night trying to study/do hw and I would really like that light up keyboard. Also Im getting tired of constantly cleaning up my white macbook, it seems if anything touches it its gets so dirty. There are other features I like but these are the majors perks to owning one.

Anyway what do you think my options are? Selling mine and buying a MBP or if apple has a buy back thing. I am just curious.
Thanks