I don't go by the sock size on the package, I'm a 6 1/2 and the socks i try on are never the ones I'm looking for! But I always feel more comfortable with smaller socks, so try the sock on and decide for yourself which size fits you best!
I am a size 7 too so here is what i wear. I wear Bonds socks so that might make a difference too. I wear size 2-8. Not saying i wear a 2 I'm saying the size 2-8 could fit well people with the shoe size 2-8. Hope this helps :)