[limoncello]

I've seen some info lately on the 2007 Cayman non-S. Looks like 2.7 liter, 245 hp, if I recall. Priced at $50K.
The Z4 coupe basic model is only $40K, but handling probably not as good. The Z4 M3 would give it a run.
Not a lot else in the class, no S2000 coupes for example. The new Miata retractable, but it's not really in competition.
If you're a convertible person (and lots of past threads have discussed the P-owner preference for ragtops), you aren't going to buy one anyway, you'd probably get a Box-S for around the same money.

So, the floor is open for comment. Who's gonna buy them, and why?

For my own part, it's Porsche entry with a ton of good looks for 50 grand, along with good-enough performance for street use, and comfortable daily driving. For trackkies, it dodges the roll bar/broomstick issues. But I think the day would come when I wanted to open the top to the sky. But that's just me.