There are a couple I haven't tried yet - the Joico purple shampoo is next on my list - but here are some short reviews for the ones I have.
So there we have it, my review of the best purple shampoo. If you want a purple tinge I'd recommend the Fudge Violet Shampoo (£8.95), if you're just looking to knock out brassiness I'd recommend the Loreal Silver Shampoo (£8.99). Also, if you're interested, I use Schwarzkopf LIVE Color XXL Absolute Platinum to bleach my hair. It's the only one I've used but it works well so why change it? Have you ever used a purple shampoo? What's your favourite?