Used BMW Z4 2003 - 2009 review

The bigger-engined versions may look tempting, but the basic 2.0i is the easiest to live with and kindest on the wallet.

It only has four cylinders to the six you'll find in the 2.5, 3.0 and 3.2, but it is quick and flexible, hitting 60mph in just 8.2sec. However, it comes only with a manual gearbox, so if you want an auto, you'll have to move up to the 2.5 or 3.0.