Your best bet - safety-wise - is probably to hire a capsule for the first 6 months (ask your local council), then get a car seat. You may still need to use that seat in reverse position for a while; i think that's what we did because it's safer that way. You will still get years of use out of it.

I've always found that the guys who install the seats (there are a few specialised businesses here in melbourne, don't know about QLD though) give really good advice as to which kinds of seat are best.