I hope the weather improves before your trip Chrissyo. It's a bit wet, windy and cold in Adelaide at the moment. Adelaide Optical have some nice Meade gear on display and they're in the middle of the city so there's plenty of other things to see and do nearby. I bought my scope and some EP's from there and it cost less than 10% more than Bintel, so that wasn't too bad but overall the prices are pretty high there compared to the Sydney shops. I think they're more interested in selling digital cameras.
Optic SA have some good gear so it might be worth having a look at. The web site is
http://www.shell-lap.com.au/ and as Exfso said, Andrew Shelley is good to deal with. Also there is telescopes-astronomy.
BTW the Barossa Valley is about 60km north of Adelaide, where all the wineries are.