It's no secret that E30-chassis BMWs are getting expensive, and a magic combination of rust, theft, and SpecE30 means that the supply further dwindles every day. That's why this $1200 5-speed slicktop is so appealing. Sure, it's been nearly stolen. And yeah, it's been on fire. Mileage? Don't ask. Even with these faults, though, it's still a deal at just …