For the beauty and extreme exclusivity, I'd probably opt for a VL Pyörremyrsky.
Its at the Finnish aviation museum at Tikkakoski.
Hmmm, I'd go with a Defiant, to recreate a unique Battle of Britain flypast; RAF fighters, with a Spit Mk.I, Hurri Mk.I, Gladiator and Blenheim I, all of which there are airworthy examples. And heck, why not throw in a Luftwaffe element with a Bf 109E, Bf 110C, with a Do 17Z, Ju 88A-4, He 111H and Ju 87B-2?
Love a good mass formation, RAF Bomber Command; Wellington, Whitley, Manchester, Stirling, Halifax, Lancaster, Mosquito, Battle, Blenheim...
FAA formation, Sea Gladiator, Skua, Roc, Swordfish, Albacore, Barracuda, Fulmar, Firefly, Sea Hurricane, Seafire, Martlet, Hellcat, Corsair, Avenger...
WW2 four-engined heavies, Stirling, Halifax, Lancaster, He 177, B-17, B-24, B-29, Pe-8, P-108...
WW2 Jets, He 162, He 280, Me 262, Meteor Mk.I, Vampire, P-80, P-59, Kikka...
I'll settle for these though: