My father had the plain old white '66 automatic with (aftermarket?) air for commuting.
I thought the '67 was the best looking because of the sharper door treatment. Probably added to the drag coefficient though.
65 Convertible Stangs (Mustangs) are very common. After my 65 Stang was stolen I got a Vette (rebuildable) because seeing another Stang brought back bad memories.