Buying used is the best choice. Just having a car 'used' for a year significantly drops it's value and you save thousands of dollars vs. brand new off the lot.
For used cars I'd recommend checking out Haldimand Motors. It's a slight drive from Hamilton but well worth it. Check out their cars at
http://www.haldimandmotors.c om/ lots of
new ones coming in each day.
For brand, Honda/Acura is very popular with students. Honda Civics are very reliable, last a long time, are great on gas and use standard fuel, and maintenance/repair cost is low compared to other imports. If you're looking for something that isn't an import and is made closer to home, Ford has some really cool tech in their cars. Parking assist, voice activated controls, lots of options for iPods and docks, bluetooth, etc.