help me make decision

I have both siphon feed and gravity feed airbrush. Both are good but I like the gravity feed more. my two cents...

badger 155 anthem

badger 100 LG

iwata eclipse cs

iwata revolution cr

^^ highly recommended, all of them

Like everyone said - get the double action. The learning curve will be worth the effort. I have the Omni 6000, a cousin of the Omni 4000 ---- excellent AB.

yup. single is easy to use BUT once you get airbrushing down there's a bit less control over what you are doing... wel... it's harder to control what you are doing. (no on the fly paint flow adjustment etc..) I would get the double action from the start and learn with that... no such thing as a learners brush.

both of the brushes you listed are very good brushes!!!

As Model Museum as said, double action AB are alittle more complicated but well worth learning how to use. Over the years I have used all types of Abs and the gravity feed airbrushes are to me the easiest and most economical type to use. On which one to go with, the Iwata vs. the Omni...though both are good brushes I would go with the Iwata. They are easy to use, easy to clean, and will do all that you will need it to do. I The CR is a very good AB and am I sure it will do all that you will need it to do.

Yes, double actions can be a bit more difficult to use but, IMHO, is well worth the extra effort.
OTOH, many double action airbrushes got an adjuster screw at the back that will set how far back the needle can travel, i..e you push down to get the air and than take trigger all the way back to get the paint according to the adjusted setting.
I think the Sotar 20/20 even got pre-set markings on that screw to make it easier to adjust the spray-width, IMHO, a wasted feature as you will soon get a feel for it.

Gravity feed won't reduce the amount of paint fumes the A/B will put out it simply requires less pressure to push the paint through the A/B as it doesn't have to suck the paint out of the bottle. making it easier, IMO to get the pressure setting just right.

nahh, it hink you'll get the same paint fumes with all of them. no escaping it. I use a siphon feed and am very happy with it.