Oh , I don't know...... Some folks would say the Saito 180 would be a good start. Don't get the 120 it weighs almost the same and doesn't come near the power of the 180. They DO have throttles.
A little Cox type engine is no match for the mighty Saito !
I knew a guy once who had a Saito and had very little trouble with it when he got it running. It was even less trouble when it was not running. His cat walked into the prop and the sudden stop broke the crankshaft but the cat came out worse than the engine. My cat really likes the Laser because he hates the taste of fuel with nitro in it. Anything over 5% and the cat won't even touch it , He must come from European stock. He doesn't need Nitro and that makes him a lot better than the American breed of cat .(sniff!) So I guess it may sound to some like I am rambling ..Oh the best engine..... It HAS to be European or all that snobery is baseless. Just Which European engine is BEST is yet to be clearly defined regardless of polls

The Norvel is the very engine I would choose for the plane you mentioned. It is ALMOST European too !