I tend to sort the celebs into fairly broad divisions based on dancing and invariably support or favour someone in the top division. Only then do I consider personality factors.

So this year as things stand:

Division 1: Jason / Harry / Chelsee / Holly
Division 2: Anita / Alex / Robbie
Division 3: Russell / Audley

I'm not especially keen on Jason but I would favour him over someone in the lower divisions even if I much preferred their personality. If the final is Jason vs Alex vs Russell, I will be supporting Jason almost certainly. However, between the members of the top division, I would favour any of the others over Jason. If the final is Jason vs Harry vs Chelsee, it's unlikely I'll be supporting Jason unless he dances in a really different class to the other two.