Hmmmm I don't know if this helps or not. If you are on a limited budget you could always build your own if you have woodworking skills and shop space. The Availibility of components; speakers, crossovers,in-box amps, sound damping material, is a amazing here in the States. http://www.partsexpress.com/
Parts express is one outlet that I've used before. Last year I built two eight feet tall line arrays and spent just under $200 us < I used lowercase since we're devaluating faster than you can say shrub> If thier stuff is availible to you in Austrailia I know for a fact that they sell several different types of amps designed to mount in a speakeer box. Some even have built in active crossovers. You might do a google search on some speaker designs that were developed by Ming Cho Lee, yes the set designer, he developed several that capitalized on wave tube technology and gave a huge bang for the buck.
Good luck !