If it were me I think I'd try to get the BBB one. It looks to me like you can adjust it up and down the whole length provided you remove or smack the exiting star nut down far enough. That means it ends up looking like a stock steerer and stem instead of the rather kludgey looking clamp on version. It also means that you can adjust the stem to sit anywhere even if it ends up partly on the original steerer instead of having to immediately jump up quite a ways.