I'm no expert but in air brushes get one and try it out and then go from there. I know it is does not sound like advice but in case you do not like using them and just can't use them you will not be out of a lot of money and some of them can cost a lot. I have a pashelle (spelling i know) but i believe it is single action and i love it. I never tried double action so can't give advice on that one but have heard not to much of difference, price mostly. I found mine in a house I was living in one time, in the attic from previous people, so I got it cheap and got lucky, but finding parts used to be a hard thing to do then when I finally found parts is cost a little. I use a Walmart air compressor that you can vary the pressure on, and it only cost about 80 bucks i go about 20 to 25 psi on mine, recommended by vendor and others as well. I have painted model cars with high gloss to 1/35 tanks camo and other things as well. I love my air brush and only use the hand brush when detailing faces and other items that you just can't get with air brush. So final thing is get one that fits your price range and go from there. Hobby Lobby (in United States) has a good range of air brushes and prices and all accessories, air compressor. Good luck on your choice of air brushes there are lots of them out there. Internet is a good start type in airbrushes in google and have fun. This is my opinion and others can get it on it as well i do not mind critics but be nice.

One shot one kill Sniper67