I'd go with what UK hippy said, if you worked in a bike shop and a girl came in asking on what lights she should get her boyfriend, or what bike. You'd know a few questions that would narrow it down to the correct one right? Same thing for girls.
I haven't straightened my hair for over a year, but when I did I always used cheapo's so can't comment on the quality of them i'm afraid. Sisters always got on with them though x