I don't know a lot about the price of Gold coins, but these Auctioneers estimates seem to be quite conservative. I wish I knew a little more on the price of gold coins because surely if they are auctioning this many in one night there would be some good buys. Any thoughts? http://theodorebruceauctions.com.au/auctions_catalogues.php?auction=417&offset=0
Estimates just get you excited and then you get caught up, watch out for buyers premium also. 15% for this Auction, so just be aware and have that in mind if you bid. Looking through the list there is a lot there, can't say I have seen similar Auctions with so much Gold up for grabs. If you can make it I reckon you may get a bargain on a Sov or two. Good luck.
I didn't get to make it to this auction, I ended up having to work but thought I would post the sale prices for anyones interest http://theodorebruceauctions.com.au/auctions_results_view.php?auction=417&year=2011