Freeman just came out with a Sulfate Free shampoo specifically for curls thats sold in drugstores. Its called Freeman Pure Color Fresh Curl Shampoo:
[url]http://www.drugstore.com/products/prod.asp?pid=152357&catid=11936&trx=PLST-0-SEARCH&trxp1=11936&trxp2=152357&trxp3=1&trxp4=0&btrx=BUY-PLST-0-SEARCH[/url]
I’m not sure if you color your hair though b/c I think thats what its intended for as well as the curls. You might still want to check it out.