FWIW, I prefer the Badger Model 200 (single action/internal mix) for most projects. There are a couple of reasons and you can take the advice or ignore it. Almost all of the single action air brushes on the market including the Pasche are EXTERNAL MIX. It is a fact, an external mix airbrush creates larger globules of paint thus a rougher finish.
Besides being internal mix, the Badger Model 200 gives you the option of different sized needles & nozzles along with easy adjustments for paint volume.
I would ask the others, touting the advantages, of their personal choice to please investigate the differences between internal & external mix. Another fact is, external mix air brushes are cheaper to manufacture.
As far a compressors, I would go with the larger model and fill the tank hours before painting. A couple of reasons, compressing air creates heat. Said heat will raise the temperature of your mix and could impair the flow of the paint being applied. By filling the tank in advance the air can cool. Also a compressor with a smaller tank will tend to pulse while the compressor is running. Doesn't seem like a big deal but I believe in gaining all the advantages I can.
There are many other things to consider but one of the most critical, when using a compressor, is to install a water separator. It will not only trap moisture but minute particles of oil that blow by the piston rings. The oil issue isn't a problem for smaller compressors using diaphragms but diaphragm compressors pulse worse than any other.
Jay