i would get black but thats just me. its my favorite color, looks sophisticated and its classy imo. white *usually* is bought by women - i definitely see more females having white iphones than males, but that isnt to say that males cant get white. dont get me wrong though, i always have thought that white iphones look fantastic, but i personally would only get black.
totally asked a bunch of my friends this same question too. all of my guy friends said black, and a bunch of my gal friends said white. however, there were a few girls (tomboyish in nature, not overly "girly" if you will) who definitely said black and that "white looks too girly". hell, even my mom said black, but shes the toughest lady i know. 🙂