With the greenly being able to use a plethoria of differant engines, for various tasks, i think you have to look to the future, and what airframes will be taking your fancy, you can always throttle back, but if the powers not there, your limited,
The Zenoahs, being old tech (but still the best out there for plodability) take some cowling in, ok for the greenly, but can be difficult to get in a tight cowl, they are tough, reliable, and VERY long lasting, and these days, the motors come in electronic ignition, so starting is no probs for the owner, But, there are more powerfull out there, ive just ordered a DLE 34 CC motor, angled plug, rear intake, rear exhaust, its got all the attributes for a cowled install, i still love my zenoahs, but there is now much more choice, it needs homework, as for the 45 V 62, they are the same physical size, i would go for the 62, but rev limit it, until you are used to the power
