Although I haven't used a vast range of Barry M products, their lip liner in 'toast' is my go-to. It is the perfect brown, nude colour and lasts a long time on the lips. I don't know why it isn't more popular. Very comparable to more expensive Mac products but it's 1/5 of the price at 2.99.
Their nail varnish is also great, I use the gel polishes and they have a great range of colours! I always buy this brand from Superdrug, so it's easily available in the UK.