Im addicted to one brand and type of polish (sally hansen insta-dri)... its the only quick dry that goes on with minimal layers and actually drys fast enough for me.
Every time its on sale I buy at least three or four, and always the top coat... and I keep a list on me, of colors I own already... If there's a new color or a set of limited editions, I buy them immediately... I check every store Im in.
I do have other brands, mostly the ones I get with my ipsy subscription, but I only use those when I have enough time to do my nails properly...
My friends laugh at me, I have a basket full of polish and they think it's hilarious that it's full, and of mostly the same style bottle! I could paint my nails daily for months and not use the same polish twice