Which CHI products....?

i know its early, but i want to start thinking about what to put on my christmas list. i need to know which CHI product(s) helps to prevent against humdity, and keep my hair from getting frizzy and keep it straight ALL DAY. I use a got2be product already but it deosnt work! it doesnt necesarily [i cant spell] have to be CHI, but any good product.