I'd say look for a compressor like this one
http://www.amazon.com/Airbrush-Professional-Air-Compressor-Tank/dp/B007HAV96U/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1374544301&sr=1-2-catcorr&keywords=as186+compressor
something with a tank atached. it doesnt need to be a huge tank, just having one atall will reduce pulsing of air supply, and extend working tmies by way of letting the motor rest once in a while. It gets hot by working and begins to condense moisture into the air supply, which isnt good for you painting.
The one i linked has a moisture trap/manometer on it, Personally I use another TWO moisture traps, one in the middle of the line, and one attached directly to my airbrush.
But i owe that to having moderate air humidity most off the time.... where you are, one may be adequate.
The airbrushes in that first link are all fairly cheap - the compressor is worth a good 60-70% of the total price, and they giv you 3 brushes! they have to be cheap and potentially shoddy... although some of the cheap stuff works just fine!...can be hit and miss
tbh.
Iwata
HPS would be amazing! rather costly and potentially going to get broken as you learn to airbrush.
I reccomend shopping for a local to you store to get spare parts from (so shipping doesnt take weeks)
and then choosing your airbrush brand based on what parts are available to you. Reputable brands include (but not limited to); Iwata, Badger, Paasche, Harder & Steenbeck, Develbiss....
If you go with a cheap airbrush.. dont worry..
tbh a whole new one will compare to a high end needle/nozzle set up for a reputable airbrush brand in price,