Welcome to a truly great forum. Sorry to hear about the Foresters demise:icon_sad:. With the research you're doing on the side I assume are sites like AutoTrader, Kiji etc. that'll give you an idea on pricing in your area, don't forget ebay and non-Subaru dealers that may have taken a trade-in. Consider something a little further from where you live if you spot something that looks good.
The SG series still have issues with head gaskets, so do a close inspection of the oil and coolant, if the engines cool you can usually use a hand held mirror and flashlight to inspect under the cylinder heads for any potential leaks. Also anything 100,000 and over will need the timing belt and assorted parts done, so that may give you some negotiating room.
Take a look at
Subaru Research Site- specs, prices, options, 2011, 2010, 2009.. Outback, Legacy, Forester, Impreza, Tribeca for your specs on the models offered in various years, that might help which model trim you might want to be looking for. The standard X models are usually where the bargains start and you can always add things like aftermarket heated seats and alloy wheels later if you wish.
Good luck in your search, and don't forget to check the For Sale section in the forum