.... I'm going to be based in Canada. ....
Thank you all very much for you're help and I made this post with a completely open mind because I really have no idea what would be the best to get for that amount. Keep the replies coming!
Where about's are you going to be? You mentioned earlier you were an international student.... depending on where you are, you may need some of those funds for parkas and other winter gear!
Ottawa = Coldest National Capital (well, tied with Ulan Bator)
Montreal = Removes more snow in winter than any other city in the world
Victoria, BC (The mildest capital city in Canada) got 1.5 meters of snow in one storm several years ago.
Edmonton = A number of years ago had over 30 days of -30 degree weather (at that temperature its moot whether F or C). But remember - its a dry cold!
Toronto = Called in the army to remove snow several winters ago. Actually, it wasn't that much snow.... but that's Toronto for you. (Running for my flame proof suit..... ) just kidding just kidding just kidding......
Seriously.... Good Luck.
If you do go with a desktop and a mobile solution, I would suggest using the mobile as your main system, and the desktop for backups/archives and games. I find keeping two systems synchronized a pain. Except that I have a .mac subscription and use that keep iCal, and the address book in synch. That way you can make an appointment on the laptop on campus in iCal, and then be sure that the desktop will remind you about the pub crawl. Are you going to Halifax? Boy, do they know how to do a good pub crawl there!