If your plane is under 29 lbs with engine and your flying around sea level a G-62 is a good choice and is cheap. I've seen a lot of pups fly with this power plant. I think the dle 55 is just as powerfull and will do fine with added nose weight. I have a da 100 in my 1/3 gtm fokker and not to worry about ripping the plane apart. In fact twins have less vibration. If you have around 800 dollars I would choose the dle 111 or a used da 100 which i bought  for $750. Twins sound nice and you can swing big prop that is more scale. Don't get those gear reduction units cost an arm and a leg for not much more power.