A cross between a Grumman AA5 & Grob 115 would be quite close I reckon
Other things I'd like -
Some kind of quick change landing light or LED like MJ says
A least a few 12V power sockets
Car like seat belts like I think Cirus have (unless you need aeros harness I suppose)
Some kind of TCAS, have flown with the one in the Tutor and ought it was really useful
Fuel tanks that you can easily visual check with some kind of graduated scale
Checklist integrated into any glass screen display
ISOFIX so people can take kids flying perhaps?