Fuddy Duddy
If your serious about modeling, invest in a quality airbrush, it is the most important tool on your bench. After a Badger and a Grex, I have finally found the best airbrush for me, a Harder & Steenbeck Evolution. I got the Silverline 2 in 1 model. I've seen great improvement in my painting since I got it. It is high quality German design, easy to take apart and clean. If you use an airbrush on a regular basis, easy to take apart and clean is very important. You won't go wrong with the H&S Evo.
Which size nozzle, 0.2 or 0.4 mm, that you use most for modeling? I have the Silverline Solo.
You should try the Badger Krome. Both the Krome and the Silverline Solo have 0.2 mm nozzle capable of very fine pattern.
Among the three, the Iwata HP-CS is still my go-to airbrush for modeling. Not that it is the best. I got it first and familiarity is the main factor. I have both the 0.35 and 0.5 mm nozzle, but use the 0.35 most of time.
All three feel well balanced in my hand, very smooth and linear trigger function, and all are easy to clean. Any of these can be the choice for beginner as well as experienced modeler. Prices are all just over $100 if you shop carefully.
On the cheap end, Neo for Iwata is a good run for its price. But it was reported to have quality control issue. So I will not recommend it for beginner who will not know what to do if he/she gets a bad one. I got one Neo and it work ok for me. Its needle is interchangeable with other made-in-China knock-offs.
I have had two airbrush that I got rid of. The Aztec A4709 was due to poor construction quality and odd shape. The "no taking apart" policy of Aztec also turns me away. The Badger Patriot 105 Fine was due to its quick paint release type trigger action. Good for painting large area, but don't have the tighter pattern the above mentioned one has.
The choice of an airbrush is very personal and people have difference perference. Don't make a decision until you try them in your hand at a LHS or art supply store.