I've got the Remington Sleek and Curl. They cost �45 and came top in a test on This Morning, and beat GHDs which were twice as expensive and no better. The Remingtons have a digital thermometer so you can adjust the heat, and I think they're awesome. My hair actually looks good even though it's usually a big frizzy mess.
I think Remingtons are the best. I have some and they are just awesome. GHD's are over-rated. Many of my friends have them and complain about them, one of my friends even comes over to mine to straighten her hair with my straightners because she prefers my remingtons over her GHD's lol.