#1 & #2
Quite possibly the next generation in EMS helicopters, that said built to a military specification and a price tag to match

uptake will be slow

These 3 babies are now NVG...
thanks to yours truly 
#3 ugliness in every sense of the word and still costs the GDP of a small nation to run, these things have inspections every 5 hours or something stupid...
#4 the most successful (aus EMS application and imo) and is currently the most used EMS machine in Aus, great work horse and is an absolute joy to fly - especial when compared to that fat thing above it.
man, lucky you did not want critique of the actual picture eh?
Now to complete your series of EMS helicopters you need, the AS365N2, you should see the westpac one every now and then up your way (based in lismore) and the S76, there is one in rocky so you might see it everynow and then.