I own several gas planes, and for small engines I like Brison and ZDZ. There are other engines just as good but the service I've received from these two is excellent. For 100cc and larger it's a toss up between DA and 3W. For a small gas plane [ under 33%] with outstanding performance check out the Kangke Laser 2000 and the Texas hurricane www.kangkeusa.com . For the larger planes Tom and Wild Hare are getting a good reputation for quality and performance, Aeroworks and Carden.