I've been trying to go sls and silicone free on all my hair stuff - shampoo, conditioner, glosser, etc. I'm telling you - it's not easy! There are plenty of products that are free of these ingredients but they don't do much for my hair! Right now, I'm in love with the Nourishing Shampoo (nourishing, indeed - I'd like to eat it) and the All Natural Hair Glossing Serum that I get online from Go Bare Skincare.
The glossing serum won't give you that mirror like shine you can get with silicones, but it leaves my hair glossy and smooth AND it's good for my hair. It smells just like the Serge Lutens Un Bois de Vanille, which is a huge plus.