I think you will find most salon owners telling you the range they stock is the best! I agree with what Matthew has written above.
I'm a Dermalogica Skincare Centre (and yes I find "Common as muck" insulting!), it does work despite what smallandcute has written, Dermalogica is expensive to set up your account but training is unlimited and you get a lot of stock.
I've worked with many different brands and each one has their benefits - take a look at your clientele, what other salons stock in your area, what do you want from a brand with ref training, budget, results driven, salon only etc. Many factors to consider before parting with your hard earned cash! [emoji4]