5'7", and my tallest are 120s. I'd love 140s, though, but I don't think it's in the cards. I've been this height since I was about 13 so I'm not worried about appearing taller, it's just that I can't walk in heels that are any higher. As it is I look like a baby giraffe when I walk in 120s.
I'm 5'8" and I max out at 5" heels, so over 6'... My boyfriend always complains that I'm "cheating" when I wear heels because they make me slightly taller than him, lol