The Pioneer Silver faced line were well-engineered classics. I don't know the value of the Australian $ at this time, but I suspect that this one is on the high side.
Their performances will shine with a change-out of all the old capacitors. So you can take that into consideration. I rebuilt an SA-8900. I got it cheap, and I spent the bucks on the caps, including the power supply cans. It is a very nice amp, and under-rated IMHO. But they all need some attention by this time. Unless you can get it cheap, let some other dude take it. If you can take it home for a few bucks and do some basic work, it will probably surprise you. The Pioneers got bigger, more complicated and got caught up in the power wars. A earlier, smaller model less powerful should be a nice amp for a smaller room and efficient speakers. Its the first few watts that count