I am planning on purchasing a GP Viper and am wondering what the best engine would be for it. I have an OS 46 FX, GMS 47 and Irvine 53 but have heard a lot about Jett and Rossi engines. Will what I have do just as well, or will I need a Jett or Rossi? If a Jett or Rossi, what size/model? I obviously want as much speed as possible out of this plane (minimum of 120-130). Thanks in advance for any input.