For those looking for a very good airbrush - at a price that won't break the budget - I reccomend that you look at the Harder & Steenbeck "Infinty" AB. The brushes are very well made and have the smoothest trigger action that I have found so far. (Even better than my Iwata HP-C)
There is only the one Infinity AB available, but it can be purchased as the "Solo" that comes with a .15 mm nozzle and a 2 ml paintcup or, the "Two-In-One" that comes with a .15 and .40 nozzle sets and 2 ml and 5 ml paint cups. Caps for the cups can be purchased separately. Also you can purchase .20 mm and .60 mm nozzle sets.
The "Solo" can be found for right at $200 and the "Two-in-One" for about $55 more. I have one set up with the .15 mm nozzle for fine work and the other set with the .40 mm nozzle for general painting. They are quickly becoming my favorite brushes to use.
These AB's are only available as gravity feeds and have three sizes of cups available - micro cup (Less than 1 ml? - don't have one so I don't know), 2 ml and 5 ml. They clean up very easily and have an adjustable stop on the back to restrict trigger travel for paint flow. Also, provided that you have a reasonably steady trigger finger, you can control the airflow fairly easily.
H&S also has a very nice AB holder/manifold available that comes ready for two brushes, and can be expanded to hold more. I've set my brushes up with quick release connectors for easy change-out. I've painted six armor models, plus some of my trains, so far and have gotten consistent results. My only beef with the AB is the fact that they don't have a needle set in the .30 mm to .33 mm range.
In the interest of finding good values, I've also ordered a Badger Renegade "Velocity" brush that I found for $105, including shipping. I have seen the brush in person, but have not had the opportunity to use one yet. From what I can see so far, they look as though they will have great potential.