Reasonably : a 1992 red Peugeot 205 GTi 1.9 (when I have 18 years old) with sliding roof and few km (I've seen one (only 25.000 km!!!) for €5.000)
Fairly (?) reasonably : Porsche 930 Turbo 3.0 (green, cream leather) or a 964 C2 convertible Turbolook
Unreasonably : Porsche 911 3.0 RS (1974), 993 Turbo S (1998), 930 3.0 (1975), 911 2.0 (1965), 997 Carrera S, ... ; Aston DB7 GT (2003); Ferrari F430 (2005), Testarossa Convertible (1984), 550 Maranello (1996), 612 Scaglietti, ... ; BMW M5; Mercedes E 55; Audi Gallardo - oops, sorry : Lamborghini Gallardo!; ....................... and much more
Very very unreasonable : 250 GTO, 212 inter, Porsche 718 Spyder (the fans know), 550 Spyder, Carrera GT, McLaren F1...