Assuming that you are American, I would seriously consider Hawaii. It has most of what you want. The corals aren't as spectacular as the coral triangle, but there's a ton of variety. It also has a huge benefit of not having to obtain work permits, visas, etc. There are a lot of dive shops, countless hotels/restuarants, and if you get bored on one island, you can pretty easily move to another one. The biggest drawback is the cost of living. If you can sort that, I'd give it a look. I'd move there tomorrow if I could afford it.