You'll get several opinions, but in your price range several manufactures are starting to see this is going to be a big segment in RC nitro engines and are coming out with several really good $200 engines. The two that catch my eyes the most are the new B5 and the new Jammin Plus. I think either would be a great buy at 200ish, but I lean towards the Jammin Plus because I'm a huge Picco fan (Picco manufactures the motor for Jammin) and think they are hugely under rated and under used.