Green isn't a colour I wear that often but I seem to have acquired 3 different teal coloured polishes.
1. 17 - Exquisite - £2.99
2. Revlon - Ocean Breeze - £6.49
3. No 7 - Dollar - £7.00
I'm not a general fan of 17 nail polishes I've always found they chip easily but I love this deep green colour. The Revlon shade is a nice green for a summers night out and I haven't actually used the No 7 green yet but I think I'll be wearing it a lot in the winter months as it's a nice deep green.
Personally I would go for the Revlon or the No 7 polish as I don't get on with 17 polishes but as the colours are so similar I would say go with which ever brand you refer or choose depending on your budget.