Reaper and Citadel paints are available at some comic shops, Games Workshop stores, and some outlets online. I have but a few paint pots of Vallejo, but Vallejo model Color and Vallejo Game color are the best paints out there.
As for brushes, I favor Windsor and Newton Series 7 and Series 11 brushes. Those are pretty much the best kind of brushes one can get, but I find that any round sable brush of reasonable quality works just fine.
A good selection includessizes 1, 0, 00, and , for those really small details, size 000. A good No. 1 flat brush is also a must, for the ocassional drybrush job.