First of all.... let me welcome you to the "board". I've no doubt you'll find our information and help useful to you as we will your fresh new insight.
As for coating guns..... we use this one with great success here :
http://www.caswellplating.com/powder/powder_coat.htm
The price is
substantially less than the competition and as you can see by the results in the pictures thread in this section, the results are stellar! Caswell also offers a full line of powders and chemicals geared towards you, the hobbyist, and the list is growing everyday!
I know I speak on behalf of everybody here (staff and members alike) when I say welcome and we look forward to having you as a fellow hobbyist. If there's anything we can do to help.... don't hesitate to let us know!.......... Russ