If you had to pick one area to live along the coast between Krabi and Phang Nga (include the Similian Islands with Phang Nga i guess) whose dive sites were both awesome and numerous, where would you go?

When I faced this question I choose Phuket. Not just for living, but also for working in diving.

From Phuket it is al within reach: Similan, Surin, Shark Point area, Bida Islands, Hin Daeng and Hin Muang. So all the best sites, whereas from other places you are always limited in choice.