I love and hate this question cause there is no such thing as just one for me...
Not obtainable-Alfa Romeo TZ2
Future obtainable classic project- Alfa Romeo Guilia Sprint 105 series (stepped hood)
Modern somewhat obtainable but not at the moment lol- Acura NSX 1st gen
Modern obtainable- 1st gen S2000 and e46 M3 CSL