You could come in to Manado from Singapore and do Bunaken and Lembeh. Then move on from Manado to Sorong and do Raja Ampat.
Bunaken is maybe the best wall diving in the world. You can see white and black tip reef sharks, huge and smaller turtles, napoleon wrasse, eagle rays, pygme seahorse, an amazing amount of fish species and more on a regular basis. From time to time other stuff like pilot whales, trasher sharks and lot of other big stuff can also turn up.
Lembeh is the macro capital of the world with all kinds of octopus (blue ringed, wonderpus, mimic), scorpionfishes (including the lacy one), frogfishes (including the hairy one) and so much more.
Raya Ampat has the current record of fish species found in one dive I belive, and you can also see manta rays and other stuff in one of the last frontiers of the diving world.
If you should choose to visit Bunaken and Lembeh, please check out Bastianos Dive Resorts. We have a newly built resort in Lembeh (
www.bastianoslembeh.com) and a newly upgraded resort in Bunaken (
www.bastianos.com). Our prices are good compared to other resorts in the area with the same standard.
We have facilities like massage (only Bunaken for now), laundry, minimart, bar, pool table and more. A public high speed Internet connection has also been installed recently for our guests (I belive we are the only Internet connection in Bunaken of this sort). Hot Spots for guests with laptops will also most probably be installed.
I wish you a great diving holiday no matter where you choose to go

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Cheers,
Sean - manager at Bastianos, Bunaken.