Thanks for the replies, sorry if I'm reposting an old topic! I'll dig around and have a read.
It looks to me like RPL plus 5 hours of Nav training and a controlled airspace (since I will be flying out of Jandakot airport) is the way to go for me. I thought that you could only carry one passenger on an RPL, or is that just an airplane specific thing I'm muddling up, since a lot of people flying on RPLs are flying light sport planes?
Also, I ended up emailing a flight school that specialises in light sport, and they told me that my 6 hours PPL training wouldn't count towards my 20 hours for RPL but would be helpful as experience. Not that I'm expecting to be done at exactly 20 hours, I understand that you're ready when you're ready.. I'm just looking for a ball park figure money wise to save towards so I can have the majority of the money there and I can get it done.