Please choose one of the first 5 and one of the 7/8/9 options.

I am curious how others approach this topic. I use engines from either catagory depending on the application. I enjoy flying the conversions, 4 strokes most of all, because you have something unique and in some cases there is no other way to do it. It's also nice to get a tremendous value for the money in a hobby where all too often the price is easily up to double just because a product is distributed as a hobby item.