Personally, I would rather save up a few more bucks and get a good airbrush from the word go.
Buy cheap now and there is a good chance that you will be upgrading the AB within a year or two, if you look after your AB well it will last you MANY years and will give you good service throughout those years.
Airbrushes, IMHO, are among the tools you shouldn't buy cheap.
In 30yrs of modeling I have owned 6 AB's 2 Badger, 2 Tamiya and 2 Iwata, no longer got the Badger ones though.