The chances of big winds and bigger waves is much greater in January. That can defeat the purpose and speed flexubility of a power cat. By late April many of the large crewed yachts will be on the move someplace else before the storm season. Anytime before June 1st the weather should be favorable. After June 1ish it could be great or rained out by sudden tropical waves. The smart money is gone from the BVI before June 1.