Have an Elliot Magma 4m on handles, dunno if they sell that over here, but indeed this kind of purchase is never a waste. I still use it to mountainboard, or to teach my mates. a strap on one back line, and you have the best safety you can get on a kite that can still have enough power to have fun with, and that will also make you more confident in your flying skills.
if I recall, when I bought it it was around 150 euros, so a bit less than $200...
It has been crashed heaps and still flyes perfectly, so I rcommend it
However, having taught over in QLD, and reading what skills you seem to have, you dont really need one (mine now is only used for fun or teaching) so if you wanna save some cash, just go for the lessons. I loved it when the student already knows the ways of the kite on the first lesson, it really makes it a lot easier.
About the schools, northern Perth: AKS indeed, though I dont really know the others (sorry guys). really great guys.
Down in safety bay, you have both WA surf or West Oz kiteboarding. Heard good things about them both, and have seen them operate. Good schools I reckon (anyone, tell me if I'm wrong)
Welcome to our world