I have just returned from the LOBO Landing in Alabama.
I had a good look at this Lynx TXP and like it.
Here is an ADSB In and Out solution that will work down-under. http://www.l-3lynx.com/
Latest technology digital TXP with approved WAAS GPS built in.
So even for the VFR guys this is a smart way to go for situational awareness and being able to see other ADSB Traffic.
Obviously the UAT and 978 features do not work in Oz.