There are many different models available that are aimed at the first time jet flyer. As Volkan suggestion, Thorjet do many kits and plans and a good range of ducted fan units, however there are many other manufacturers of DF jets. www.jethangar.com have many ARF jet kits which may suit you.
Field space for takeoff and the surface you fly from must also be taken into account when buying a first DF jet, as they need to get upto speed before they'll lift off....