I'll throw my two cents in, get a cheap-ish single action for primer and make sure the compressor has a regulator and tank the other bits are standard. Check out the Iwata brand of double action air brushes for 80% of your regular painting.
That will cost around $500 but feel free to pick up goods like glass eye dropper, 2,3 or 4 way taps to hock up muilitable air brushes, several mini metal trays for mixing paint, air brush stand, self cleaning pot to remove waist, 100 bamboo kaba sticks and alagator clips (to hold your model pieces), air brush parts (eg. needels and nozles), cleaning thinner. These bits and pieces makes the job much easier and all are under $10 but together adds up.
If that left over money is still burning a hole in your pocket pick up a Tamiya spray stand and a sonic wave cleaner for maintenance. Excluding the cleaner this is what I have and am able to pick up a brush and start painting with in a few mins...