G'day wombat & welcome. You lobbed onto the best AU forum! At least in here you can let loose with a bit of good old aussie lingo...& we'll even understand what your on about!
We also offer technical information as well.
The GSO 12" Dob is a good choice, at least you wont get 'aperture fever' in a hurry. Even though I'm not a dob mount fan, (only equatorial's for me) I fully understand why most people go this way these days...cos' their cheaper!
Have fun with the new toy when ya get it!