GP Extra 300S .40
I have one with an OS 46fx, slimline pitts muffler, and running an APC 11x5 prop. Flys very well, not over powered but no dog either.
I much perfer the sound of a pitts muffler on a two sroke to the 4 stroke sound.
I have also built one that I haven't covered yet, got the other one used, good building kit but I second the advice about not using the rubber band method of tank placment.