Last Christmas: Taylor, Jimmy, Ashley or Cascada?

So I just posted about this song a week ago, but already there’s another version out from Cascada, the electronic pop artist who was able to record one song and be the biggest pop artist of last year. Which version is best? The original, I have discovered, was done by Wham, though I don’t have that one because it’s so old. However, I have clips of the four latest versions below: and which one is the best?

Here’s Jimmy Eat World – Last Christmas (2005):

Here’s Ashley Tisdale – Last Christmas (2006):

Here’s Taylor Swift – Last Christmas (2007):

And Cascada – Last Christmas(2007)