For MY yard I think the white would look best. But I like them all, although I would want the middle one in a different color, or with some more contrasting trim.
What does your yard look like? if you have any bit of land I think I'd want the third, barn looking one. I just think in my tiny yard that would look silly.
I think it depends on what your house and neighborhood look like. If rural, the gambrel or middle one; if you have a modern house or are in a more urban environment, then the top one. Personally, I would choose the top one if it fit my neighborhood as it is definitely the most stylish... but as we have a very old house, I'd have to get the middle one as the simplest and least obtrusive. They are all nice - can't go wrong!
Cheers,
N. VA