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According to observations from Chandra it looks like the Big Rip is off the agenda (See here)

Current observations also show that even with dark matter there is insufficient mass for the the universe to collapse in on itself. The fact that the universe continues to expand and the rate of expansion is increasing, the Big Crunch does not look like it will happen either

The only one left, that conforms to the rules of physics is the Big Chill, as this ties in with the second law of thermodynamics and the increase in entropy leading to what physicists call The Heat Death of the Universe

Let Brian Cox explain a bit more about the second law and entropy

Youtube video