Moosp - I have flown R2160 and CJ6 - not just joy rides.
Comments: R2160 VP - never head of it. Always FP in my experience.
Do some research on Sydney Aerobatic School - Bankstown Sydney. They have been operating R2160s for years. The owner will give you experiencied opinions on operating this type of a/c in the aero training role. Including -ve g fuel starvation through spinning - air start recoveries no problem.
CJ6: Beautiful to fly. Bit advanced for the early training role though IMO.
Tandem seating makes it difficult to teach attitude flying (if trainee is in rear) and relative stick postions. All controls are fullt duplicated in rear. IMO side-by-side is eaiser to instruct and better for the student. Compared to R2160 operating costs will be higher - retracts, VP prop, radial, full etc.
Have been 'trying to get hold' of Uncle charlie for a while ! Turns out that one of the owners has gone AWOL and in uncontacable or maybe its reluctance to sell as I;d like to export it to NZ.
Please feel free to PM me as we're HK neighbours.
K