My most neutral colour is Mauve Maven , it's like a dark nude camel colour and perfect for every day. If I want a brighter colour I just use a normal polish over it and when I am ready I use a non acetone wipe to remove the normal polish.
I like Macchiato, when I onky do a couple of coats. It's too "warm" for me, though, to wear as an opaque colour. I've just ordered Baby Doll Pink, and will only wear a couple of coats, I think. Pink Chiffon is a light candy pink, which does not appeal to me. However, I don't like shimmer in my polish, so won't be trying Evening Sand. It's so hard to find the perfect neutral pink gel polish!
I tried OPI Passion, but the polish triggers heat flares and peels. Both of which suggest it needs thinning, but then that will be another £12 or so, so buy thinner and hope that it works.