I'd go for the Pro. I have an old 13" MacBook Pro (the black one), and I love it. Even though it's majorly lame compared to the new ones. You're going to need this computer to last you through university, so it's worth it to upgrade. You'll probably want to go 13" since you'll be carrying it around. Laptops get heavy after a while, and 13" will fit better in your bag with other books and stuff.
So this is life, eh? Hmm, I'm surprised; not what I was expecting. I guess I'll roll with the punches, and take it one day at a time. I'll find love where I least expect it. I'll laugh till I cry. I'll make the best of every moment. And most importantly, on the day I die, I guess I'll be able to look back and say, "Damn, what a ride!".
RIP My darling. We'll all miss you, now until forever.