17. BMW Z3
BMW is famous for its compact sports sedans with powerful engines. But ever since 1995, it has also produced some sporty roadsters in the form of the Z3 and Z4. There’s a wide arrange of models and the early ones are affordable. But the later ones could go over $20,000 limit.
Look for the six-cylinder versions since they deliver lively performance along with a charming, open-air driving feel. The Z3 and Z4 are light and compact and most drivers view them as the perfect summer cruiser. They also produced the Z3 as the Z3 M with a 255 HP straight-six engine. So if you find one that is for sale and it fits your budget, go ahead and buy it.