The Twin Com is the aircraft that will do the job for you in the most efficient way. Fuel consuption will be 15gl total @ 160 knots (indicated at low level). In Oz there are some very knowledgeable people who will be able to you if you have problems, more over, they even produce their own parts (due to CASA rules). As for parts, some are more difficult to obtain than other but all are available, especially as Piper said that they will start to produce parts as needed, even if they have to reverse engineer them, price unknown.
If you decide to go for the twin Com feel free to contact me (by email) and I will introduce you to some people that will make sure that you won't get burnt, they can find the aircraft for you, will inspect and repair it as needed if you instruct.
Pilot DAR
These 3 bladed props, are they FAA STCed or just during development? How much are they? Some people will give their right arm to have these on their aircarft.
Thanks