Josef, as to which model/kit? this depends on a few things! including the amount of building you want to do? flying skill level? and budget?
There are just so many kit options today it can be difficult choosing!
Sport or scale??? if you want an F15 ( you suggested Regal Eagle), my suggestion would be the Top Gun F15....
Although my first D/F was a Byron F16 then a Byron MIG 15, both of these Byron kits and fans can be found at times for sale hear on RCU for good $ value.

Of the various ducted fan choices! I would say Dynamax and Ramtec of the larger fans only because the Byron fan is harder to come by, but it is a good fan unit as well. As to best motor for these fans thats easy! - O.S. 91 fan engine it is simple to set-up and a very reliable engine.