Thank you for such helpful answers. It has given me a lot to think about!
I think certification-wise, I will definitely continue with Nitrox and Rescue Diver. I agree with the need to obtain diving experience in diverse conditions no matter what the end goal. As such, I might consider participating in the Buddy Dive in Bonaire or Liveaboard for intense and short-term increase diving count in warm and high visibility conditions. And at the same time, finding local diving buddies for more consistent practice in diving, hopefully with night diving, navigation, cold and low visibility, and quarry experience.
I am undecided about ultimately obtaining DiveMaster. As was pointed out, DiveMaster requires more then $400 each year for insurance and fees. If I did pursue such a certification, I would want to get much more diving experience beforehand so I am confident and comfortable, especially if I do teach others.
I am obtaining a degree in genetics and have studied marine life genetics. It is a lot of lab work (indoors and physically inactive), and I recently realized I would enjoy life more if I could supplement my basic science research with something physically active that I enjoy (scuba-diving). As such, I was considering a longterm goal of possibly serving as a DiveMaster over weekends. This would allow me to continue enjoying the outdoors physical activity of diving while teaching others and possibly diving free. At the same time, I know researchers also use diving as part of their projects and thought it would be great to develop skills to possibly participate in research diving projects (related to marine life). I read on a site about research diving that DiveMaster level is beneficial (but not required), so that was another reason I am considering eventually obtaining DiveMaster level.
About the minimum of 50 "deep" (or for many of you, "not so deep!"
) dives, it is a stretch, but I would love to participate in a research project at the Aquarius Underwater Lab. If a scientist wants to be considered to contribute to a research project there, they are expected to have about 50 dives at around the 60 foot level (the depth of the lab itself); diveMaster is not required. I was hoping to obtain 50 dives at that depth level soon so that I could be listed as eligible candidate earlier and hope that one year I could participate.
I am not sure about logbooks. It seems more like an honor code. I hope to fill out the details for my own learning purposes, but I also wonder how to keep my 50 "deep" dives looking more official? I am assuming instructor stamps or signatures help. As such, I wonder if I might be able to find programs at Bonaire or Liveaboards where a dive buddy (possibly somebody with more authority or experience/certification) could sign or stamp dives for me? Or would that be an unlikely setup in such locations?
Thank you again for your advice.