Bubbles != a good shampoo.
The best I've ever found was a pH neutral one by Wolfs IIRC, practically zero bubbles but wonderfully smooth. Not seen it for years though sadly.
Right now I'm sticking firmly with Envy's own shampoo, by far the closest I've found and does a superb job. http://www.envyvaleting.co.uk/products-info.asp?id=295