Ian - you might want to see if you can get a flight in a Robin 2160 - it's much better for aeros than the Citabria, which is slow to roll and needs a lot of rudder to help it round. The Decathlon is much better than the Citabria, IMHO.
The Robin being a tri-gear and a reasonable tourer, would probably also be better to cross-hire or for initial training than a tailwheel like the Citabria, which means more usage and better costs amortisation. A lot of passengers will probably prefer the side-by-side seating, too.