cavalier, sunfire, geo metro, geo storm, anything you want really. I would go with a cavalier if I was going to do that though. They are lighter than the cobalt and the z24's and what not look pretty nice.
Email ME = firstname.lastname@example.org HOLSET FTW! Busted Sleeve Club Member
2006 Cobalt SS Supercharged - Holset HX40 spooled by the M62
2003 Evolution VIII - 13.7@99mph stock on 10psi(wastegate pressure) NOW MAP 2.3ltr/MAP EF4 2012 times coming soon
1992 Honda Del Sol - Beater in Germany
2007 Hayabusa - 10.8@132mph (1st attempt at drag racing a bike)
Do an old VW Bug. They make the tranny adapter kits for the Ecotec, and at 1800lbs you can't go wrong! Or you could drop it into a 01-05 Cavalier that had a regular Ecotec in it, since that would be an easy swap.