Sailboat Motor Conversion - 5kw or 10kw?

[PipeDreamIII]

Hi All,

I'm looking to convert the motor on an older Hughes 26 Sailboat. The boat weighs about 4500lbs, and has a hull speed of just over 6 knots. I'm debating between the 5kw and 10kw motors. I'd like to hear from others what they've put in and what they would recommend.

Thanks!