Not that you need (or maybe even want) advice on selling your boat, but here is my thought, speaking as if I were a potential buyer (and what I looked for when I was).
1) There is an active market of people looking for C-Dorys, and they often sell quickly (so it is possible).
2) It's reasonably easy to sell to someone long-distance, due to the trailerability -- not like a big boat that "has" to sit at a brokerage until someone comes along locally.
3) The boat is pretty straightforward/simple/obvious to buyers.
So to me, rather than hassle with broker/storage/commission/time/autumn coming, I would just clean it up, take great photos and produce a comprehensive ad, and be ready and willing to help people buy it (detail photos, e-mail response, etc.). Then price it at just a shade less than you think you ought to get. People will likely be lining up for a quick sale. As they say, there is nothing that price cannot cure. Which is not to say there is anything you need to "cure," but just that boats that have the things mentioned above seem to sell like hotcakes, whereas the ones with no photos, you have to pry the information out of the owner, and/or they are holding out for every last penny, "I don't really have to sell," etc..... well, they seem to linger on the market for longer. And ultimately I don't know that the seller comes out ahead, all things considered, even if they did (finally) get a bit more money.
Of course there are many ways to sell a boat - just my thoughts on it.