Good list.
You had me until I saw the PT Turbo. Miata would have been a better choice.
Also there's one Solstice convertible on Trader for under 20K
2006 PONTIAC SOLSTICE Convertible 2D
Manual, 2 dr., 4, Gasoline, Silver exterior, Black interior, AM/FM Stereo, Air Conditioning, Alloy Wheels, Anti-Theft, CD Player, Driver Air Bag, Dual Air Bag, Keyless Entry, ... more
$ 19,900.00 32,048 km