panda, this is arguably the best forum for Aus MTB,
http://www.rotorburn.com/forums/forum.php where members post up everything so you'll be able to see what's working for them, organise rides in local groups etc. They have a good classified section also...I bought both my 24" BMX & dirtjumper from members
Edit; You ride so my only tip would be to approach a dually (if you go that way) with respect, you'll be able to ride downhill (short X country sections included) a lot faster because the dual shocks will dampen the feedback through the bike & your true speed will only become apparent when you need to brake hard & maneuver around something. The rest you'll work out
Hippie; nice ride!