At $230, the Bio Ionic is pricier than any of our top picks. But you get what you pay for. You can truly do with your hair whatever you desire — straight or curled — in one pass. And, if you’re worried about it breaking a few years after purchase, the Bio Ionic comes with a five-year warranty. By investing in a better-quality tool up front, you won’t have to replace your flat iron every couple of years. Plus, the Bio Ionic goes on sale every now and then, so it’s worth keeping your eye out for deals.

All this is so well documented and that's great! I have poker straight hair but I crave for curls and more volume all the time. I also use flat iron to curl my hair but the difference is - I'm NOT able to do this good job. But it is also damaging my hair so I'm trying some more ways to curl my hair without heat which I read here http://thelifesquare.com/how-to-curl-your-hair-85...And I must say one of them worked for me really well.
With well over 25,000 reviews, the HSI Professional Ceramic Tourmaline Ionic Flat Iron is one of the best straightening irons you can get, but because of its thin build and rounded plates, you can also use it to curl your hair. It’s got solid ceramic plates to reduce damage, evenly heat hair, and promote shine, and if you’re a traveler, it’s got a dual voltage that can be used anywhere in the world.
With so many models and styles to choose from, it can be hard to find the right hair straightener for your medium or long hair. That’s why we love the Cloud Nine Original Flat Iron! This straightener is ideal for users with medium to long hair; this hair straightener can tame even the most stubborn tresses. Featuring 1-inch plates and low, medium, and high heat settings, this flat iron is ideal for anyone with thick or lengthy hair.
The nano ceramic plates in this straightener deliver far-infrared heat, a gentler alternative in and of itself. As if that weren't enough, there's also a reservoir where you can pour in some of the (included) argan treatment and thermal protectant, creating a conditioning steam that will strengthen and safeguard strands while you straighten. Admittedly an extra step, sure, but one that's well worth it.
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