Planning on also Wreck and Night, but undecided on the final one. Thinking it is between Photography (but no plans yet to splash out on expensive kit - only have a go-pro at moment), Fish ID or Peak Performance Buoyancy. Any recommendations of the above or any others I should consider?
I recommend PPB. However, in the interest of full disclosure here are two caveats:
1. Any course, within any agency, involving any standards can be positively or negatively affected by the Instructor. And, I know nothing about any Instructor with whom you might work.
2. Anything that I recommend reflects my own personal preferences as an Instructor, as well as what I, as a diver, think is really important. What you think is important may differ.
My preferred AOW course includes Deep and Underwater Navigation as the required dives, and Night, Wreck and PPB. PPB is always the first dive, and I place considerable emphasis on optimal weighting, buoyancy control using breathing, horizontal trim, and finning when I teach PPB. That is my approach, but you won't be taking the course with me, so what I do may have no relevance to your training.
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Nonetheless, I recommend PPB to any diver interested in developing precise control of their position in the underwater world - which is an essential skill for any diver interested in exploring that magnificent underwater world, AND which may enhance their learning in any additional specialty training which they may later pursue. I also recommend that AOW students complete both PPB dives - NOT because it gives them a specialty certification, although that is nice, but because it gives me more time underwater with them to help reinforce concepts address in the PPB Adventure dive, and to extend their learning with additional skill practice and new skill introduction.
You choice should be based, at least in part, on a discussion with the Instructor(s) with whom you might work, in whatever Adventure Dive you select. Ask them WHAT they teach, HOW they teach, and WHERE they place their emphasis. It might help you make a decision.
Have fun.