The perfect ambulance aircraft would have to meet the following requirements:
Capable of landing on a hi-way or helipad;
All weather capability;Fast cruise speed;
long range capability; smooth, quiet, large cabin; and Preferably pressurized.
That leaves only the AB 609.
If not the 609 , the new AB139 sounds promissing; large cabin realatively fast for a helicopter (145?)or the EC 155. The 155 is also equipped for flight in icing and has a large cabin with a realatively fast cruise speed.
The SK76 would be great if it could handle ice. Rumor has it that there is a kit coming out for the C+ but I can't say for certain.
Best cheers
IHL