I run a 200hp engine and I'd tell you that is the ideal size for a V. Others will have a different opinion. Really, it's whatever you're happy with speed wise. I like to get to where I'm going in a hurry, and I have a long run to get to the open ocean, so for me, a 200 is almost a necessity.
I think you'll be happier with a 150. Power, fuel economy and just overall performance will be better.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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