Hey, you’re actually not restricted to any of them.....The way it kind of works is Telstra provide 80% and the rest share. So for instance you may be able to get Aanet or IInet as a provider once you have ADSL in the area. I found these guys to be a great ISPs over the years
I actually work for ‘T” as a main contractor and they are currently revamping the area.... yours I’m not sure. I l know we have projects to cut over Cedar Grove/Vale replacing the DLC ( PGS) with ISAM to enable ADSL2 in that area, so I would imagine the you wont be too far away.
The best option is to call or try most providers.. that way they can race to take up the remainder of the 20% left under the Gov regs.... hang in there.

Also I agree... Rally all the Glenloganites

and try to get them to register interest on the big T www pages ( I actually did this 3 years ago in my space & it worked) Do a letter drop to them all and give them all the info they will need to navigate or call to express interest. Sign up and them change to a new ISP once your contract has expired. Once you have it you can churn to anyone else that offers a better deal