I'm hovering around 400. Many of them are common brands like OPI, China Glaze, Zoya, Wet n Wild, Orly, Sally Hansen, Misa, and Essie. I have a few peppered other ones like Chanel, Illamasqua, Fingerpaints, RBL, Deborah Lippman. The most consistent brands for me are Orly, China Glaze, Zoya and Essie. Essie is my "nudie" brand. I have quite a few of their nudes but I adore each new nude they put out. Zoya, China Glaze, and Orly come out with good products in a wide range of great colors often. OPI is usually a great brand but I have had a few dud formulas from them so I don't claim them as a favorite, although I do love most of their polishes.
Recently I have been venturing more into indie polish companies like Candeo, Dollish Polish, Cult Nails, and Rainbow Honey. Sometimes these small companies or people make amazing stuff! Also recently addicted to SquareHue lol