There are two schools of thought on starting cheap to see if you like it. One is, obviously, it saves money if you don't end up using it much. The other is that if you go too cheap the quality will be such that it's too hard to use; with great skill one can compensate for poor quality equipment but you really need something good when starting out. This goes for virtually anything that takes skill to operate, be it a telescope, a manual transmission, or an airbrush. My rule of thumb is to start with only a modest price but avoid toy quality cheap.
I have two airbrushes. I ordered the Harbor Freight double action unit and have never found the right fittings to attach it to my compressor (a small, tankless one I got from someone who wasn't using it).
Then I bought a little kit, Testors I think, that holds a siphon feed jar in front of a compressed air can with a single action trigger; this one may violate my rule above, but it certainly does work. It sprays only a wee tad smoother than a rattle can; it's advantage is that it allows for mixing one's own colors, and that's what I bought it for. I've barely used it since the first one or two color mixes, and have gone back to rattle cans. But I'm not out much.
I guess all I'm really saying is mull over why you want to buy an airbrush at all before spending the money. I bought the Harbor Freight just because I wanted to try one out, and it's probably a good entry point for that (based on other people's reports) which I'd still like to do once I unpack the compressor and get the parts to hook it up. I bout the El Cheapo for one purpose, and it worked for that. If you already know that you're committed to mastering the craft then don't waste time or money on half measures and get a real, high quality rig.
. I have several airbrushes and use them pretty often. What to get comes down to- 
