Mine has a Suzuki 140 4 stroke. (same as the Johnson 140 4 stroke)
Cruises all day at 30 plus knots.
43 knots at WOT (just under 50 mph)......there's probably a tad more if i faff with the prop size but I really can't be arsed.
My suggestion for what it's worth is get the most powerful engine with the best power to weight ratio your boat and you can handle and afford...to buy and run. It would be a real pain to find it under-powered so soon after getting it.
On that basis alone...take a look at the Suzuki and Honda specs re weight
The Suzuki 140 is 410 lbs
The Honda 135 is 485 lbs
75 lbs heavier and 5 fewer horses
Food for thought anyhoo.