I currently own and use a Detail Master Excalibre (the silver one with 2 ports) with lots of different Fixed Tip Detail Master Vented pens (the silver aluminum ones). I also have a couple of Razertip Tips sets that I mount in a Razertip interchangeable tip pen.
If I was buying a new system today I would purchase a Burnmaster Eagle (the red one with 2 ports) with Burnmaster Replaceable Tip Pen and Tips. The 10 tips available from Burnmaster are good for beginners. In the long run you can add more tips by purchasing sets of tips from Razertip.
Currently the $259 “Burnmaster Eagle” available from “Packard Woodworks and other retailers for roughly the same price looks real good to me. I like having 2 pens and only need one set of 10 interchangeable tips.