Since the operation is in Oz, and there is a dearth of Gazelles in the Southern Hemisphere, I'd suggest that's a non starter
The 206 will give the best entry level turbine for a start up operation in Australia, without a doubt. Predictable DOC's, reliable (if you look after it, but that goes for any helicopter) and able to turn to almost any charter/aerial work task.
Squirrel is nicer, but the operational costs and the poor factory support would kill the operation stone dead unless you have a 3+ year-set-in-stone contract that actually makes a profit
