I'm an OPI fan. I started with the deeper reds and burgundy and branched out into some vibrant pinks, dark purple, I have a really dark charcoal grey. I do also have a bit of a Tiffany blue in the London brand that I like.
I really like Essie for drug store brand. I've been wearing a lot of Naughty Nautical this summer. Zoya is also really nice they make unique and beautiful colors. I like Godiva by Zoya but it's very glittery so the texture is annoying. My nails look like diamonds when I wear it. This past winter I wore Zoya lotus a lot. It's a dark grey purple. Butter of London makes the best quick dry top coat. It's $20 a bottle and worth every penny. My home manicures always look great for at least a week.
I'm a fan of OPI. I like Butter but most of their colors don't suit either my tastes or my skin tone. I rarely wear color on my fingernails because I'm hard on my hands and if I do a GOOD job I can get it to last 2 days, not usually worth it. So when I do, I mostly wear it on my toes which lasts a long time. So I also will tend to get bolder colors that I might not necessarily wear on my fingers.
For fingers: My fav Butter color is Yummy Mummy - a sexy neutral that UWHuskygirl recommended. OPI - You Don't Know Budapest, the BEST and most perfect shade of periwinkle lavender EVAR.
I'd have to look upstairs for what some of my other colors are. I really want to go get a coral, I forget the name of the one I found.