Never dealt with the business you have listed so can't pass comment.
You are in Sydney. Are you able to visit Bintel. They sell an 8" Dob which is a rebranded GSO. It might suit your requirements and they are great to deal with (I am not associated with Bintel in any way).
http://www.bintel.com.au/Telescopes/...oductview.aspx
Also worth looking at Astro Pete's in QLD if you don't mind paying for shipping (Saxon and Skywatcher Dobs).