Okay, i can offer a technical opinion on this as an IT Techie
First things first you need to find out what your options are in terms of providers if they have their own DSLAMS in the Telstra Exchange.
There are a few, Telstra, Optus, Agile (Internode), iiNet and not sure if TPG have their own DSLAMS which is a DSL Mux that delivers the Adsl service over copper to you.
If your exchange only has Telstra and Telstra Wholesale who on sell their ports to other internet providers to provide internet to their customers via telstra equipment, then your out of luck and will need a copper line.
Telstra Wholesale do not offer Naked DSL hence those providers using Telstra Wholesale ports will not be able to offer you naked dsl.
However if other providers such as optus, agile, iinet, and tpg? Have their own DSLAMS in your exchange your in luck and will be able to get naked dsl.
Check this link to Whirlpool Broadband choice
http://bc.whirlpool.net.au/ and input your phone number in and see what options are available.
Alternatively you can also have a look at
http://www.adsl2exchanges.com.au/ and look at the left hand side under States and select status and look for your exchange you are connected to, scroll down and see what providers (with their own dslsams) are in that exchange.