A 3rd or 4th generation Honda Accord (late 1980's/early 1990's) can be had in excllent condition for that amount of money. A well maintained Honda can easily surpass 200,000 miles, so even if the car has 60-80K on it already, it still has a long life ahead of it assuming it was properly cared for. According to KBB, a perfect example of the 1988 Accord LX-i that I own would be worth roughly $3,000 which is rather amazing considering that that price assumes a car with 194,000 miles. An Accord identical to mine (minor body rust, but perfect mechanicals) would set you back around $2,500 according to KBB. For a reliable college car, I don't think you could do better than a late 80's/early 90's Honda. Any Honda model of that era should be within your price range and will prove to be practically bulletproof if properly cared for (ie. oil and belt changes). Follow the reccommended maintenance and the car will be running long after you get tired of it.
Zenmervolt