I've narrowed it down to the Hamanasi. Can't go wrong with 3rd best hotel in Caribbeans I guess. Treehouse looks awesome as well. 2765/person for 7 nights including flight, dives, transfers, food, etc.
Chabil Mar at 3880$/person for 7 nights is incredibly expensive and though Placencia looks awesome, I'm not convinced it's the best bang for the buck even for a luxury resort. At least, I'm not convinced it's worth the extra 1100$/person for the trip over the Hamanasi.
TIR, in spite of the awesome diving it seems to provide, is expensive as well if you consider the accommodations and the limited dining options (3369$/person for 7 nights).
Liveaboards appear to be tremedous, but for this trip, we we're looking for a vacation with some diving, not a diving vacation. We'll definitely do it one day. I'd choose the Sundancer II over the agressor though, based on the reviews. Bigger and a bit cheaper. A 7 nights stay on the Sundancer II would come at 3185$/person, which is still quite bit more than the Hamanasi. I'm sure it's the best diving of any other option, though.
We probably will NOT do the BH on this trip. We'll definitely do it when we do a liveboard in the near future anyway.