The thing to remember is what Yodaddy said. "The hull speed" is around 7mph. For those that don't understand that, he means that as a displacement hull (Not counting, tide, current, wind or other outside forces) the most you'll be able to do is around 7 mph, no matter what size engine you mount. As you come up on plane, and less of the hull is in the water, your speed will increase, but if you cannot get on plane then count on about 7mph tops.
For me, I run a Honda 9.9 4-stroke as my kicker. But I just aquired a Mercury 9.8 2-stroke long shaft electric start. Since it matches my Merc 200's cowl I think I'm going to switch and use the Honda just for fresh water. I like the 9.9 size speed, it's just about perfect for trolling in a V.
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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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