Everyone has given great advice.
It's not so much the brand as they all have a model that will accomplish what you want.
As far as spraying acrylic or enamel, the same brush can handle both.
It's when you get into inks and/or dye's when you need the really fine
needles that can't handle the heavier medium as the paints as well.
What I would like to add is that it is best, if at all possible, to
actually hold the different airbrushes in your hand or better yet test
spray with them. I know that's not always possible, but that was the
deciding factor in my purchase.