You can do that, or if you visit your friend at uni and order while on campus then you don't need to mess about getting your mate to pose as you. I ordered my MBP from a uni campus and I used all my details, never once needed to enter any student credentials..
13" would indeed be fine for day to day use, I only went for the 15" because I wanted the hi-res screen... Sometimes I think it's TOO high if there was ever such a thing lol. It sure looks pretty though. Definitely recommend it for the anti-glare screen, right now I'd have a reflection of me and lots of posters behind me on my screen, but nope. Really really nice. A lot more money over the 13" though....
On a complete side note, I just read the "love Microsoft?.." thread. lololololololol... My keys aren't glowing though
It's daytime.