Looks like we have made the decision to visit WDW on our next trip.

I did some costing and WDW is actually slightly cheaper than DLR.
Rough plans so far:
Depart Brissy on Nov 28th to fly to Orlando. Most likely will fly with Qantas, but will keep an eye on V as well. Will wait until later in the year to book in case some special fares are released.
Nov 28th to Dec 10th we will be at WDW staying on property. We are looking at ASMO and CBR at this stage. Will hold off booking for now to see what specials may come up.
I had originally planned on 8 days on property and then 4 days off as we will be visiting Universal and doing a few other things as well. Decided that it will be just as easy to stay in one place.
I've booked a car for Dec 2nd to 9th with National as this can always be changed. I was going to book for four days at the end of the trip, but it was actually the same price to book for a week. (Actually a few dollars cheaper) We can now break up our days in the parks if we choose and do the other things we want to do.
We will fly to Syracuse NY on Dec 10th where we will rent a car for the duration, travelling onto Canada where we will stay until Jan 3 when we will fly from Syracuse to LA and then back home.
I will start looking for FF seats from LA to Orlando asap. Seats should be released over the next few days. It will be Thanksgiving weekend when we are travelling so I want to get the US flights booked first.
I will probably book the car for Syracuse as well in the next few days. Last time we went the best rates were found very early.