Sedu, Chi, or FHI flat irons?

So I've always used cheap curlers and flat irons. I think that most I've ever spent on a flat iron was $29.99 but I'll admit, it do not give my hair that salon look that I'm looking for. After hearing a lot of reviews and watching a lot of youtube videos, I see the look that I'm going for on people who use Sedu, Farouk Chi, or FHI flat irons? But I just don't know which one to choose. Folica is having a 20% off all hot tools right now and so I want to get a flat iron since I'll be getting it on a discount. Which one is best?