WEN by Chaz Dean is supposed to be really good, but I haven't tried it myself yet since I just ordered it.
Chaz Dean is a hair stylist/colorist in Hollywood. He came up with his WEN cleansing conditioners because he believes the sulfates that are in most shampoos are damaging to colored hair. His cleansing conditioners are sulfate free. Not only do they replace your shampoo, but it replaces your conditioner, deep conditioner, detangler, etc. I read so many good things about his line so I am really excited to try it.
You can check them out here chazdean or on QVC.com .
I am really loving one I just got from Joico called Moisture Recovery. It is not specifically for color treated hair but is safe to use, gentle, low-sudsing and has Marine Extracts....love it!