Depending on what you plan to do with the boat, I might recommend going electric. I did on my E35 and wouldn't go back (though I did have to sail overnight with my girlfirend and I taking shifts to get back to Seattle from Port Townsend this past weekend due to light/no air fighting a 3kt current). If you are curious, feel free to pm me or look up my blog on
www.sailingcinderella.com. I apologize for the website being a bit rough, but I'm still learning. The whole motor install was about $1700 including cheap batteries.
Pros - She floats higher, nearly no maintenance, no more gas station stops required, boat smells cleaner, LOTS more room in my cabin, cheaper than a typical re-power, no more warming up an engine, quiet operation, way more control of rudder speed and therefore prop walk/wash.
Cons - I can't motor all day anymore. I can go for about an hour at full throttle, or 3-4kts for about 3 hrs. Requires a bit of education to install and configure.