The second post in my nail polish dupes mini series is on purples.
1. Max Factor - Purple Haze - £3.99
2. Bourjois - Bleu Violet - £5.99
2. No 7 - Violetta - £7.00
These colours are virtually identical. I have used the Bourjois polish for years and love it as the quality is really good but in terms of colour the cheaper Max Factor one is a good match. If you get a £5 off No 7 voucher that always seem to be floating about then try the No 7 polish in Violetta but I've always loved the Bourjois So Laque polishes, they have a good pigmentation, long lasting and have a nice shiny finish to them.
Overall, I think this one is just about personal choice and how much you want to spend on a polish.