You have 2 basic areas to chose from, Morehead City and Wilmington. For a group that big, Morehead City is your best bet but I suspect you may not be able to find a dive op with that many spots open. Our boats fill up fast, most dive shops book in Jan or Feb and we do not have ops that handle large groups. Unless you are willing to split the group into several parts, no op is going to be able...or at least not likely willing..to do dives that can accomidate novice and tech on the same boat. If you have never dove NC, this is not the Keys. Our wrecks tend to be a long way off shore and deep. 2 to 3 hr boat rides in 4 to 6 ft seas are the norm and the wrecks are in the 100ft range give or take 20 ft. You should also have a backup plan (and your divers need to understand this) with things to do when you don't go diving. It is common for us to call off trips due to rough seas and that means in excess of 6 to 8 fts waves. You migh get lucky and get a week of flat seas but at times as many as 1/2 or more of our diving days are canceled....and trust me, you do not want to go out if they are. If you are planning a Caribbean style trip with a wide range of divers you should do a little research on NC diving and plan accordingly. NC diving can be fantastic but it is not the Keys or the Caribbean, those unprepaired for it's riggors get more than they bargin for. I would encourage you to call some of the ops and discuss your plans with them.