Could be a great engine for that boat if, like most people, you'd stay at or below 8kts. Another 110hp would probably get you to 10kts at 4x the fuel consumption - hard to see when that would ever be helpful.
Also, a single 110 is likely to make your life much much better when it comes to maintenance versus, say, twin Lehman 120's. We have a CHB41 with twin Lehamn 120's and I'd prefer a single, particularly if it had a bow thruster.
One thing someone is sure to point out: if you are going with a single, you'd better make 100% sure it's maintained and tip top condition.