I got my gear from the below business, couldnt get a nicer person and so helpful with a wealth of knowledge, there are many ways to put the systems together I suggest reading the forums and having a rough Idea on where u want to start then asking things u dont understand,, I am putting my system together now and each day an new question pops up.
Have alook at some of the systems on here, they rang from very small to absolutely huge, from commercial bought to bathtubs and plastic lined holes in the ground.
http://www.freshbynature.com.au/You sometimes see him hanging around in the forum here
Bree