I would say check around and see what used Surly Long Haul Truckers are selling for, and price a bit under that. Unfortunately, you don't have a well-known brand (I had never heard of them, and I'm fairly up on bike brands), so you lose some value from that. Also, it looks like Advocate Cycles is closing/changing their name to Esker Cycles, so that doesn't help, either. I would definitely sell the 650 wheels separately to get maximum value back from them.

A guess to what it would sell for? Probably $750-850. Be sure to load up any ad with good keywords, and compare it to the Surly LHT, Trek 520, and other similar models. Use those as keywords, too.