I think I recall a forum member who had a 266 (same boat different label, if I remember correctly) with twin 115's (230 total hp). I don't think he was satisfied, and swapped the engines for more power. I would go with a 300 hpdi if single power was the only option being considered...
Of course, my memory could be wrong. Try using the "find / advanced seach" feature to possibly find the 266 / twin 115 discussion I'm referring to.
< edit > I found the link. Here it is:
Sailfish 266 / twin 115's
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