I want a new hair straightener for Christmas but I'm not sure which one is the best. Do you know any straighteners that actually work?

The best one I have used so far is by GHD. It's expensive but I love it.
It's also used in salons.

Yes I use a very good ceramix one which won't dry your hair out it works really well its not too expensive for what a hair straightner can get up to but its not exactly cheep

I have used Chi for a very long time.
And am a faithful fan.
If you do get one get the Chi pro.

Also Paul Mitchell has a great iron out as well.
That is also Eco Friendly.

If you don't want to invest that much into it just make sure you get one from a local beauty store. They have a better selection made for professional use.

And yes ceramic is essential.

Get the CHI. I have one and its amazing! It's a little pricey but its definently worth it!

I will suggest you to search some good hair straightener through Google.
You can check some quality and reasonable price hair straightener over here - hairstraightenercare.com

Chi or sedu

The folica.com ad in your post has good ceramic flat irons.

FHI's!
Amezin.
Had mine for nearly 2 years and they still work as well as when I got them.