I haven't received it yet, but I just ordered a Paasche VSR90 gravity feed airbrush. It comes with two different sized paint cups that you can quickly attach/detach. Here's one link that is selling the ab for about $65 US.
http://www.dixieart.com/Paasche_V_VJR_VSR90.html
I have a Paasche VLS which works pretty well, so would think the VSR90 will also work well.
Larry