First of all get away from YBAF. Hire costs are insane there.
The numbers I got from the few I talked to at YRED are similar for per hour VDO. Though I think you can sometimes get the landing fees waved and there's no $15 tower fee. YCAB is a long way for me to go, but given the low hours I'm facing, it might be an option. Are there any others nearby Brisbane?