What straightener shoul I get?

I'm looking to spend around 80 dollars. I want one that comes with a warranty. I have pretty long thick hair. For the most part it's straight when I blow dry it except for the ends. They are wavy.My ends are always dry but aren't split. I'm thinking of getting a tourmaline one but don't know what brand to get or what temperature I need it to get up to. What brands are good?What websites are good? I don't want a chi. Any advice would help! Thanks!