986 is about the right size for me (6'2", 185lbs), meaning I'm not rubbing shoulders with the passenger. And the car is pretty comfy for day to day driving.
Met a guy on a PCA cruise 2 week ago, he was at least 6'8" and he had to get a 996 Cab because he can't fit in a Boxster and needs to recline the seat back on his 996 to fit.
Miata / S2000 are both too small for me.