Here is the median Brisbane rent for 2 bedroom apartments, as sourced from the RTA based upon information provided to the RTA when rental bonds are lodged or updated. This does not distinguish between furnished and unfurnished apartments, and does not include lease renewals where the bond amount does not change. This is for the September 2012 quarter.
Post Code 4000 (Brisbane City): $585 per week
Post Code 4005 (New Farm): $530 per week
Post Code 4007 (Hamilton): $420 per week
Post Code 4101 (South Bank/ South Brisbane): $510 per week
Post Code 4066 (Toowong): $395 per week
Post Code 4067 (St Lucia): $420 per week
Post Code 4068 (Indooroopilly/Taringa): $385 per week
There is a lot of good rental information on the RTA website at: Median Rents Quick Finder
Do not use WhatRentMyHome. This "service" is operated by a real estate agency, and the information it provides is inaccurate and out-of-date, and is misleading.