I subscribe to a website that gives crowd estimates. Their crowd calendar shows the crowds being slightly lighter for the late Jan/early Feb dates you mentioned. For the 6th thru 12th, the crowd calendar shows more 5s and 6s (out of 10), while the later dates show more 4s and 5s (even a 3!). Truthfully, I think either time would be fine. We went this year the week of the end of Jan/beginning of Feb and the crowd levels were much better than I had even expected. We enjoyed it SO much that I just booked another trip for 2008 -- January 21st thru 26th. Can't wait!