I fully endorse the Paasche H single action brush. It is idiot proof to clean and will last forever.
I am still using the one my dad bought me 29 years ago!
Sure I have bought other airbrushes both single and double action, but I reach for the H in 98% ofwhat I do. You can get broad coverage with it and if you practice you will be able to get almost a pencil line. The H has three tips available. #1, 3, and 5. I almost exclusively use the #3 tip. If you get the H set it comes with everything you need to get going except the air compressor!
Cheers,
Max Bryant