If the boat is in good nick the price is good, A little risky buying a boat private from AU. I would feel much safer buying from a dealer. What if you pay and he doesn't hand over the boat? takes the $ and moves away? Things you have to consider.
I bought a Seafarer 228 recently private sale I got the owner to sell it through a dealer and I paid extra for that. All went good , had a new trailer made by Ace trailers and shipped it to Port Kembla ( I live in Sydney). I had a mate inspect the boat for me as I couldn't fly over at the time and paid a pro to report . This was a fresh water boat from a lake in Georgia , old boat 1999 with a ox 66 250 and I re powered with a 250 Optimax as soon as I got her , then sold the Yammie here for good money.
This is my 4th US built boat ( 3 Trophies before that) and my first GW , great boat , glad I bought a GW this time, Trophies just don't compare .
With an old boat you have to make sure the transom is dry, all the trim not stuffed , make sure the boat never lived in the water, the hydraulic steering still ok and of course the engine. Make sure the fuel tank is still ok because its very hard to replace, if the boat was always on a trailer it should be fine , they are painted alloy and should last a long time, mine is still like new.
Mine didn't have any electronics to speak ( most US boats don't) she had a new VHF, a new cd , old basic sounder and thats about it
Like seasick said you don't want S/S through hulls bellow water level , mine has bronze, a lot of the S/S you see are plastic with a s/s cover. Very easy to replace and plastic are very cheap, mine didn't have tabs either so I bought a set of Lancos , I prefer them to Bennets as you don't have hydraulics to worry about .
Good luck with it, another GW down under , not many in AU because they are expensive!!