Hi
I've gone diving twice in the Maldives in October and found it absolutely fine. The sky was not always deep blue and cloudless, but it was mostly sunny nevertheless. Since the Maldives are at the equator, the sun is always right above you and the corals get optimal direct light for underwater photography. Visibility was good when I was there and so were the diving conditions.
I already heard of the luxurious liveaboard that Smokey mentioned, and its comforting to hear that its as good as it looks. However, in the Maldives I prefer living on land. I like taking romantic strolls along the beach at night and feeling the sand between my toes. Plus I prefer to be on an island in case I something happens and I can't dive. My favourite option is making full day trips with multiple dives and returning to the resort for dinner, with the option of a night dive on the house reef. Note: you have to choose you resort island/ dive centre selectively if you want to unlimited diving. Many resorts require a boat trip to reach the house reef. Other resorts dont make full day excursion, but return to the island for lunch.
Hope I didn't confuse this for you by giving you other ideas.
Sylvie
PS: Returning to the Maldives in five days.