Hi Peter,
How is sunny Melbourne? We
sold our 380 privately last year through the cruisers forum. I would suggest trying some free sites for a while and maybe one of the larger international sites. I think some are only around $100
Most likely your buyer will be Aussie. Is the other 400 still
for sale in docklands? I'd guess that would be a similar value. I'd suggest selling price would be around 10% less than asking! it's been on the market a while.
Selling paperwork is easy enough to arrange yourself.
Also many brokers will forego the commission when you are
buying a boat through them, so if you have decided on your
new boat and are happy with the price, discuss it with the broker. Ie, I'll order the
boat if you list mine free

Obviously the benefit of not using a broker is you can share the savings with the buyer and both have a win/win situation with the 30k savings.
Also keep in mind with
internet advertising today, most people buy houses, boats, cars etc after seeing it online. They don't go to brokers and ask what boats they have listed. It's most likely any enquiries will come from a website. Take some nice photos ( the one that was at docklands had excellent pics)
The Aussie dollar is in your favour for selling locally and the
boat is Aussie registered and has gst and duty paid, so that's at least a 80k saving for anyone considering
buying overseas and sailing back to aus.
So know your boats positives and share them with potential customers. I know from speaking with you in the past you love that 400 and there are no negatives, fastidious owner, low
engine hours, highly speced plus all the extra add one you have added make it better than new.
If I wasn't typing from
Portugal on our new L400 I would probably be in Melbourne working out a deal with you

Good luck on the sale and
new boat (have you decided on one yet?)
Rob
P.s. We love our 400!