It looks like an nice place for divers. Is there anything for non-divers to do? My wife, a non-diver, likes to tag along on these trips. She does snorkle and kayak but would need some other activities to keep her busy for a week..
8 days 7 nights would be more attractive. If you are going to be spending a lot for air fare then stay as long as possible.
The group rate looks pretty good, very affordable, even if you added some extra nights.
I have been looking for a fall dive trip sometime after October 5th so I am interested.