I bought my DD a Solia Tourmaline Ceramic Ion Hair Flat Iron 1-1/4". It is rated higher than the Chi according to the reviews on Solia.com
http://www.folica.com/appliances/straightener.htm
There's an ebay seller that has Buy It Now auctions on Solia hair straighteners for $66.99 The Solia has a temp. control that the $100 Chi does not have, therefore, it's less likely to fry your hair. Also, the Solia is Touraline which is also better for your hair.
It's not a $30 straightener, but the best you can buy for the quality. You get what you pay for.