I also own a 20ga Straignt Grip, DT, 26" gun. Oh, how I wish it would grow a beavertail and 28" barrels!!! Other than that it is an wonderful gun that I think is worth in the mid-$3k range. If I wait 2-3 years it may be worth more...
As Bob advised, Doublegunshop.com is where I would first list any quality double.
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