I was very successful with a TGA F-15 as my first ducted fan aircraft so I have to agree with most of the pilots that responded. From my experience I believe that the TGA F-15 would be the best choice for your first Ducted fan aircraft. Not only is it a great flying beginner jet model but the support that the company gives you can't be beat either. I always tried to gather as much information about the kits and their Mfgs support before I purchased. If you would like to do the same, call each Mfg and talk to them. I do not have all the other Mfgs toll free numbers but TGA's is 1 (800) 380-JETS. FYI, Out of the two F-15 versions TGA offers, I liked the F-15 Pro best and they are having a Christmas sale on them.
Good Luck with which ever model you choose. With all the help that is available on this site you can't go wrong.

Paul