Word of warning Marge , your ping is related to your location & the line quality between your home & the exchange , also the number of hops (ie.other exchanges) to reach the server , this has very little to do cost of your internet plan per month unless it's a really fast connection , & that still won't guarantee a low ping.
Game Server is located in Sydney because it is where the international pipe is among other things , so how well you ping into Sydney is your issue.
Dodo is a horrible ISP for gaming or anything else imo & whatever you go with , avoid them.
You should start your search here.
http://bc.whirlpool.net.au/
Just enter your telephone number so you can see what services are provided from your telephone exchange , & are available to you as a internet customer.
They also have a dedicated forum for internet recommendations if you don't mind of multiple pages of recommendation requests here.
http://forums.whirlpool.net.au/forum/92
Cheers
i0n