I don't own a dob but GS are acknowledged as the best value for money. If you are shopping for the best price, then you basically have a choice of two dealers, either Bintel or Andrews in Sydney.
Bintel (
www.bintelshop.com.au ) usually inspect and collimate your new toy before despatch, Andrews (
www.andrewscom.com.au )on the other hand usually ship the box uninspected. You may pay extra for the service offered by Bintel, but as you are in Mackay it may be worth the extra, in the end the choice is yours. There are also standard and deluxe models the diffierence in price is around $100 from memory. The deluxe model has a crayford focusser and fans to speed up cooldown time of the primary mirror and for the money is a must have. Bintel have the 10 inch premium at the moment for $799.