hi
For details of weather records in december you could play with this link...
http://www.wunderground.com/history/....html#calendar
january and february seem to have more sun......so delay the wedding?
Someone suggested the kata thani....yes it looks great on a great beach but kata noi is a very quiet location, if you want a good hotel with more variety (not in the girl sense as you'll be all loved up) I think the advice to find a quality hotel closer to patong is good advice.
If your looking for solitude and a better beach....try nai han...further south but a great beach!
don't forget to bring some wedding cake for the forum members so they can soak it in cider........sorry singha