Which used Smart Forfour Hatchback hatchback should I buy?
A wide range of engines means there's a lot of choice. Petrols include 1.0, 1.1, 1.3 and 1.5 versions, and they all give decent performance, with outputs ranging from 64bhp for the 1.0 to 109bhp for the 1.5. The 95bhp 1.3 is the one to avoid. While performance is fine, it sounds too coarse.
There's also a Brabus performance car, which uses a tweaked 1.5 to give 177bhp. It's very quick, beating a Volkswagen Golf GTI to 60mph, but it's also very expensive.