If you are talking about December 2005 and don't already have a reservation, the best DVC resort will be the one you can get a reservation for! There is only limited availability at all of the DVC resorts for this December. If you don't already have a reservation, my advice is to call today and see what is still possible.
We love the BWV during the Holidays, but the largest majority of WDW resort lovers will tell you VWL is the best during the Holiday season. Since you have 3 little ones and will probably be spending most of your time at the MK, I'd have to agree.
Best wishes -