1978 Chevy Chevette Scooter. About 300-500 bucks, torquey four cylinder, four speed manual trans, rear wheel drive, and 49/51 weight distribution.

Also good are 1st gen RX-7's (watch for oil huffers, they're the ones with blown apex seals), Mitsubishi Starions/Chrysler Conquests, Datsun 240, 260, and 280Z's, 3rd gen (1982-1992) Camaros, Fox body (1978-1993) Mustangs, and any number of small British sports cars from the 60's and 70's.

Mk.II MA6X Toyota Supra, which i've heard is a very capable drift car.