My opinion would be to go with the Y/A starfire, by far the best DF that I have personally had the chance to own/fly. The intake and exhaust design are super efficient, (design just for a DF unit). Mine can take off of a rough grass field no problems and top speed is well over 150mph. Plus it lands fairly slow and has an excellent glide.

You can get them from www.yellowaircraftplanes.com

Also Bob Parkinson seems to be trying to make a come back onto the jet scene I purchased a video from him and the planes look impressive but I have no personal experience. His website is.

http://www.rcjets.com/

Also the new A-7 ARF from JHH looks to be a good one as well.

www.jethangar.com