Poonpossum:
I don't know of any GA company in Aust where you can start as a newbie flying scenic in a C172 (or similar) and work your way up through the ranks to fly turboprops (willing to be corrected).
In the broken, fragmented career that is GA, it seems to me that you work your way through the ranks as your experience & skills grow, changing companies as required to climb the ladder. So to me, it makes sense that you acquire the skills as required, at the appropriate "step", rather than acquiring them all at the beginning (of your career), and getting rusty.
Just my 2 cents (not included - GST, en-route charges, fuel levy, landing fees, head taxes, credit card fees).