I believe Emotiva only does direct sales. You won't find them at a brick and mortar store.
I did a cursory search on Google and found a few hi-fi shops in Adelaide that have a wide range of gear from electronics by Anthem, NAD, and Cambridge Audio to speakers by Tannoy, PSB, Paradigm, and Monitor Audio among others. I think you'll be able to craft a system on a budget that will allow you to keep your headphone setup and will give the LS50 / Naim a run for the money. Since I don't live in Australia, I can't vouch for their reputation, but here they are (for what it's worth):
Also inquire about buying floor models or demo equipment to save money.