First off how thick is your stencil going to be? I have printed .5mm pitch with .009" apertures with a 6 mil stencil. A 5 mil would have been better but the 6 worked just fine.
Pitch is not necessarily the deciding factor for paste type. it is the aperture opening that determines what mesh you will need. Use an area ratio to determine what you need (area of aperture opening vs. area of aperture wall).