Id go somewhere in Indonesia. If you need cheaper and easier to get to then Philippines.
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BTW, a very well phrased OP, well defined, not the usual eye-rolling silliness.
Enjoy your adventure.
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I dived in Boracay, Koh Tao, Phuket and Puerto Galera. Nothing can equal to Puerto Galera: super good and comfortable diving, very rich of different sea creatures. Also, cheapest place I have ever been.