Me and jason must be twins.

5' 11" and 250lbs; well 247 but close enough.

I am currently driving around in my Miata with its hardtop on. I'm comfortable in that too.

As for the Crossfire, the hatch area is immense. It would almost be perfect for another seat...almost. The headroom is on par with any sedan though the windows would lead you to believe different.

Late 80's, early 90's Corvettes (C4) are a problem. It bends you at a hard 90-degree from the waist down. It's like sitting in a bad lawn chair.