As far as nail polish, I really love Covergirl, Essie and Milani. They're the brands I use the most often. Sephora also has a nice line of polishes called Sephora by Opi.
I always use Opi's Natural Nail Base Coat for the base - it goes on smooth and dries fast! Lately I've been using Sally Hansen Insta-Dri top coat and loving it, too.
Also, if you haven't tried glass files, you should! They last forever and work quickly. They're all I've used for the past few years. :)