Maybe I missed the requirement for the OP's boat in this thread to be trailerable, but while your comment above may be true for a Sundancer 260, I don't agree that it is for a larger Sundancer.
Your boat is a pretty neat little boat, and I could see how it would be a great trailerable boat for use on large lakes, while affording one the option to trailer to different boating areas.
Not sure, though, if this is a boat that I would want to take offshore. A Sundancer 320, however, with its 11 1/2 foot beam, and 21 degree dead rise is a nice combination for coastal cruising in nice weather. Also, while I think sterndrives (I/O's) are a good fit for some boats, if I planned to keep a boat is saltwater, sterndrives would not be my choice.
As I noted is an earlier post, there is no one best boat for everyone. A boater needs to really think, and be realistic, on how they will use the boat they plan on buying. This will influence the choices of newer/older, sterndrives/inboards, diesel/gas, trailerable/non-trailerable, go fast/go slow, cruiser/trawler/houseboat/other, flybridge/no flybridge, inland/coastal, freshwater/saltwater, etc., etc., etc.
Jim