Microsoft Surface with USB = winner for me
Some people argue the USB isn't required because we are in a wireless age. Everything should be wireless. This is all great until you don't have a network connection or the Internet. But the biggest value, for me at least, is this:
I know certain Android tablets have it, but they don't appeal to me much. I can now store all my music and videos from other sources on this flash drive while conserving the internal drive for my Zune Pass downloads.