Paul,
We sail on Lake Huron - where are you?
You might want to consider your particular harbour. Our 3.0 hp is generally fine in all conditions; but it definitely take some skill and patience to get out of the marina when it's blowing onshore with significant chop (Great Lakes swell ;-)). We get some nasty swell down the harbour channel mouth sometimes, and some more power in that situation would be welcome. But, once we're clear of that, there are no issues.
Kuy