Any condo on the Island will put you in proximity to great dive sites. As to the complex you choose, this is a very subjective question. It depends what you are looking for.
Look carefully into Association fees & utility cost (they may be higher than you anticipate).
Talk to as many people as you can. In person is always best. This chat room is a good start - but will not always provide the in-depth information you will need to make an informed decision. (there are many commercial interests here)
- Talk to current residents (and neighbors) of the complex if possible. (aside from your realtor) .
- Read the Association bylaws (this can be very important).
- Inquire about the Home Owners Association / Complex Management. Some complexes have a lot of "issues".
- Consider your lifestyle: Do you want to buy in a quiet residential complex., or one that is more active, some complexes have a revolving door of vacationers (who tend to have less respect for neighbors & property). I have seen some Very Wild party's in rental condos.
You don't want to be relaxing by the pool with your kids and find yourself in the middle of something like this (or maybe you do?):
http://www.blackeroticaguide.com/vacations/nightlife.htm Spend as much time on the Island before you buy -
and a lot of good info will be shared over a Mojito, that you will not get from this board.
Belize is a Great Place! Take your time finding your perfect piece of paradise.