Australia / Moving to OZ with Polish Girlfriend [4]

Hello,
My girlfriend and I are strongly considering moving back to Australia next year. We were wondering many things about this.
To start, we have looked in to a visa as a partner.......this will allow her to work, live there legally etc. but it is very expensive 1200 euros. Does anyone have any experience with this?

Is there a better visa or process you could recommend?

Would a student visa be a better idea?

Also - any people in similar situations who are now in OZ would be great to talk with more.

Thanks,
Dave