If I had my wish come true, I'd like to have a Beech T-34C Turbo Mentor for my trusty steed. The T-34C is a tandem seat, turboprop version of the famous Beech Bonanza, except it has a conventional tail instead of the Bonanza's “Vee” or “butterfly” tail.
The T-34C is fast, forgiving, and fully aerobatic.