What is the best straightener?

So I have this cheap Conair straightener and it really really sucks. I have to straighten one piece of hair over and over and my hair is still a bit wavy. (I don't have mega wavy hair... Just a little) what's a reallllly good straightener that I can get for 100$ or less or even 150$. Somewhere in that range. That basically in one swipe my hair is perfectly straight.