Teise,
if you have not done so already, you may want to post this on the airbrush forum as well.
i use a Badger 180-11.
it has auto shut off, is pretty quiet (i run it in my apt), but the water trap and regulator were separate, i think.
cost around $150 to 180 3 or 4 years back, if i recall.
good luck,
ed.