The coupe, the vert, the roadster. Prices vary with every version. Some of the prices we see are correct for the Kappa, imo. Low mileage, well maintained, limited production run, you get what you pay for your fun out there. 30k or 13k, still pretty good bang for your buck.
To me and I'm old school goes something like this:
Roadster: No roof what so ever. A cover maybe over the seats, but not a folding canvas top of any kind. 2 seats, 2 doors, front engine/rear wheel drive
Vertiable : A folding top soft/hard 2 seats FE/RWD maybe FE/FWD
Targa: Fixed top with removable soft/hard tops for conversion
Coupe: Fixed hard top with an optional sunroof maybe a 2+2 version GTA
Any and all combinations of these fit the bill for a permagrin kinda day.