AirSpace - more than just hot air
Without hesitation, deliberation, consideration, evaluation or prevarication; it would have to be the Vought F4U Corsair. Superior to the P-51 Mustang in most respects and with, arguably, the greatest recip. aero-engine of all time...the P & W R-2800 twin-row radial. Our Royal New Zealand Air Force operated over 400 of them so I should like to experienbce what so many of my older chums did when they were just lads.
Failing a Corsair, it would have to be the truly wonderful Douglas DC-3/C-47; of course!!!!!
"Happiness is a sodding great Pratt & Whitney...bliss is one on each wing!"
Just one!? OK. Then it has to be the Hawker Sea Fury. I know there are few airworthy examples and I still have a few years left (wink!)