How much would it cost (AUD$) to travel India for a month? backpacking mainly but with 2 or 3 hotel stops too?

Dear friend I would like suggest to you that you should contact to any Indian travel company they will be assist and guide you properly about your total travel expense (AUD$)
I would recommend an Indian travel company.
Company website http://www.iconindiatours.com
I have recently used the travel services from this company for my previous India trip.
Best of luck

Hello friend
i am Sourav i had read your situation but I would like to suggest you that you should contact to any gud travel tour travel company . This tour company far cheaper then other travel company. If u would like to go golden triangle tour then that travel company will be assist and guide you properly about your total travel expense and give extra discount to this tour.
I would recommend an Indian travel company.

Company website http://www.indiatourismhub.com
Company website http://www.travel-monitor.com

I have recently used the travel services from this company for my previous India trip.
Best of luck