I'm 5'8 and my bf is 6', and I'm the kind of girl that wear 4" heels every day lol... I don't mind being as tall as him, or taller if I'm wear 5" heels. I love it, and he loves it - he way prefers it that I'm tall!
If it doesn't bother your man, then it shouldn't bother you ^_^ (but IMO it shouldn't bother you anyway! I love being really tall, it's excellent and nothing's better ;D)
I'd say buy them if you like them, if it's only a inch difference that's barely anything! Just tell the man to pretend you're a supermodel and tell him he's lucky, cause the taller you are the longer the legs, and the longer your legs look with hot heels! ;D