I have the 16' and fish sturgeon from it, and would recommend this set up for sure.
https://abbotsford.craigslist.org/boa/d/similkameen-2005-legend-xcalibur/7159956287.htmlMy 16 is the perfect all round, river/lake/family/fishing machine. I do not hesitate taking it on the Fraser on the sections I am familiar with the gravel bars. I fish sturgeon/ salmon when you could/ fish the harry, small lake/big lakes.
I can still put it in some of the smaller lakes in the interior for fly fishing, at the same time have no issue with putting it into the big lakes that can blow up at times.
My 16 has a 50hp 4 stroke that I feel is a bit under powered with 4 occupants and loaded, but now a days it is usually just 2 guys fishing out of it so I now feel it is just right. I have owned it since 2007, gone from 2 small kids, and wife on board through to having 2 big kids 2 dogs and a wife on board. I went through the 2 foot ides days and now enjoy the comfort of having 2 - 3 people again.
34mph- 1 occupant / 30ish- 2 occupants / 28mph - 3 or more and loaded after getting on plane. With any Legend they say you should max the HP out as they are on the heavy side, so this 18' is probably no different, probably somewhat under powered but not an issue in my opinion.