The best brush for the money for RC use, and is a little easier to clean the some of the others in the same price range would be the Iwata HP-CR, and then with that brush you will need a hose as well (be sure it is for the Iwata brush, as some of the other ones wont work). Another good way to go is with the Badger 150 or 155 anthem, or the Paasche VL, both the Badger and Paasche brushes can be bought as a kit, that comes with the hose, and a few other things. The HP-CR is a top feed brush which makes it easy to clean, and you will have a little more consitent spray pattern, and the other ones are bottom feed brushes which make it easy to use, as you can get a bottle top for the faskolor paints as to use the paint right out of the bottle, but they are a little harder to clean, and they can waste more paint then the top feed brush. Also the Faskolor brushes are nice as well. Another options you can go with is to get a single action brush (the others are dubble action brushes) which will make it easy to get the hang of air brushing, but you will out grow it a a fast rate, and you won't be able to get the fine detail that you will get with a dubble action brush (I have both types)
Although what ever you do stay away form the testor aztek brushes, as they will give you more problems then you think (I have a few).
Then you will need a compressor to go with you brush, I recomend one that has at lease a 5 gallon tank as you will get a better air flow, and there will be less water in the air for the compressor always running. Them you will need a regulator, and water trap to contorl the air, and clean the air. Also if you want you can use a shop compressor that has a 100 gal tank if you wanted as long as you have a regulator and water trap on it.