The main brands of dobs are GSO, Skywatcher and Orion. You will also see some Saxon ones which are made as a less expensive option by Skywatcher. Bintel sell there own dobs which are rebranded GSOs.
GSO dobs are good value for $$$ in my opinion, but the Skywatcher and Orion ones are a distinct step up in quality of the build and materials.
If not in a desperate hurry to buy one, attending a camp or viewing night is a good idea. Snake Valley in March (
http://www.iceinspace.com.au/forum/s...81#post1223181 ) or the ASV Party at Heathcote the weekend before
I would also suggest that you start your own thread!!
Hope this helps
Malcolm