The cost: About $21,000 to start
The top: The Miata now offers a choice of two roofs, a manually folding cloth top or a power-folding hard top. The cloth top can be raised and lowered one-handed without even having to take off your seatbelt.
Amazingly, the hard top version has just as much trunk space as the cloth top. That's not an enormous amount to begin with, but it's enough for a couple of bags.