I've been pretty lucky so-far in the 60 or so types in my logbook to cover most bases, but I've always had a real hankering to have a go in the back of a Tornado. Not for the performance and handling, which I know are crap, but to see how the worlds only genuine 2-crew fast jet works. The CRM pilot.v.Nav fascinates me.
Aside from that, well maybe a whimsical desire to have a go in a Sunderland, and at some point in my career I'd like to do a bit of airship flying. My old chum Dragcurve has been off playing with them, and keeps sending me Emails that send me green with envy. Neville Shute's "Slide Rule", fascinated me on that subject.
A little lower down the list, Spitfire and Meteor, to see how the best ever piston-prop fighter, and the first ever jet fighter worked and compared.
G