I was using Chris Christensen Day to Day on Riley. I sent an email to the company asking what they recommended and they recommended the Spectrum 10, so I bought that. I like the smell of the Day to Day a little bit better, but I like them both with regard to the silkiness and smoothness it leaves Riley's hair.
You can buy trial kits for $10.00.
Shampoo Systems Kits Sample Sizes for Pet Grooming, Show Dogs & Cats
I believe you can also buy those kits on Amazon.com.
Good Luck!!