I have curly frizzy hair but I don't straighten it. I find 3 things helpful in keeping frizz away. 1. don't blowdry (of course if you want to straighten your hair that may be hard...) 2. use a good product after washing to help weigh down your hair. I use an organic leave in conditioner that is like a thick cream. 3. Wash less. Frizzy hair actually needs oil. So I was told by hairdressers to wash my hair once weekly. Once I started doing that, my hair texture improved greatly.
Having said all of that, I don't blow dry or straighten, so I can't help much with that side of things.
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