Chelsee for me.
I think Harry is a lovely guy - really sweet and just "himself" which I like.
But like I think it was Pet Monkey indicated above, it is Chelsee who makes me watch her.
Harry is a beautiful dancer but he is just missing the sheer joy in dancing for me - he executes it so beautifully, but I want to see him "live" it and love it.
Chelsee makes me really enjoy a dance - in fact, I was so transfixed watching her jive, I actually didn't notice the stupid donkey until I watched it back again! She also makes me watch her intently instead of Pasha, which is REALLY saying something!
Either (or indeed Jason, whom I really like as well) would be a worthy winner, but if I have to watch any dances back of the three finalists, it is Chelsee's QS and jive I turn to first, so she is my first choice to win.