I can highly recommend Corioliss C2. I have used GHD in the past and they have nothing on Corioliss. Sadly when my C2s died I upgraded to C3, which are still better than GHD, but not as good as the older C2 version.
Ha ha naughty me! My hair is just below my shoulders and also quite thick with a natural wave, so I still need to work at it to get it smooth. Sadly as I said the C2s were better than the recent C3s, but both are still way better than GHD, in my personal opinion! I would still do your research and read other peoples reviews so you get a good range of advice/ opinions x