Seven years ago I when I was flush with some discretionary cash, I splurged on some warbird flying in NZ. I had several flights in a Yak 42, a Stearman and a Vampire and one flight each in a Harvard, a Mustang and a Spitfire.
All the flights were memorable, but the Spitfire was without doubt, the best. Very expensive but worth every penny, for the memories and seeing other pilot's reactions when I mention I've got stick-time in a Spitfire.
I'm indulging in this reminiscence to mention that warbird rides in NZ are now on a more organized basis and to point out that a Spitfire ride is significantly cheaper than in the UK - about £2100. Anyone who has a reason to go to NZ and thinking of flying a Spitfire, I recommend doing it at Ardmore:
Warbird Adventure Rides - Flight Experiences