This poll is going to operate on the hypothetical that you've switched to the PC as your primary source of gaming. If that doesn't represent you and you lack the imagination to put yourself in that scenario, I don't care - go find another poll.
So you've got your PC, and you have the option of purchasing ONE (and only one) of the three next-gen consoles to complement your gaming experience. Which are you most likely to go for, and why?