As others have said, it's a good time of year. It's sort of a cusp season in some places and the weather may be changing, so choose wisely. I personally prefer to get to Sorong via Singapore since I don't much like Indonesia domestic air travel, so the less I can do of it, the happier I am. From Singapore, Manado is a snap. Hooking on to Raja Ampat trips at that time of year, I've personally put customers at Bali, Manado, Ambon and the Togians/Gorontalo through Singapore. It's also possible to get to Dili from Singapore, though none of my divers have yet combined the two.