I am a shampoo/conditioner horder.

I have tried lots. I have found what is best for one dog may not be best for others. I started getting sample sizes before I purchased. I know toplinepets.com has samples. Also Yorkietalk Splash and Shine too. Chris Christensen has a sample pack you can purchase. And I believe it is Bio Groom that will mail samples to you also.
My personal favorites are Yorkie Splash and Shine and IV San Bernard. Hope you find one that works for you.