I have the F3D from Kangke, with a ST 45 up front...and it does haul the mail!

Another plane that would get a nod would be the Kaos ARF from Tower. Of course, I'd stick a 61 in it, and convert it to a tail dragger. This plane would most definately handle high speed.
Man, it's too bad they don't make a "30" size Kaos...that would be the ticket!
Have you heard of the Zen 30, from World Models? That would be a great option for ya!
Gary