I've got a Badger 350, which is pretty much a single action entry level airbrush. I use it to paint micro-armor and buildings, but it's best for base coating and such. Any kind of finer detail work, it's not the one.
My friends use Badger 150s, they can paint 3-color camouflage on 1/300 scale microarmor with them, so you should be able to paint N-scale and above. Though we usually use enamels, and not much in the acrylic realm.
I'm thinking about moving to a Paasche, for my HO-scale stuff.... Need to be good with acrylics, since that's what I normally paint with these days. I'm leery of the previous comments regarding the 100XFs with acrylics...., they're used for illustrators and nail artists. I didn't think they'd use enamels for that sort of thing.... I might be interested....
Kennedy