Wow PADI is definitely different that NAUI
I went this route:
Open water, which let me then get my Dry suit, night diver, underwater navigator & peak performance buoyancy. Learning to hover was a bitch!..
Adventure Diver which let me get my deep water (I’ve been 120’) its’ fricken cold! LOL..+ plus in so-cal you really don’t see anything .. and I started to nitrogen narcosis so I really don’t go below 100’ anymore..
Advanced open water diver which let me get my search and recovery & rescue diver
Now I can go to master scuba (highest level a non pro can achieve)

or do the divemaster then start teaching emergency first response instructor, etc..
The following certs I don’t have yet but do need to get for my own knowledge is:

Enriched Air, Wreck Diver, Cavern Diver and maybe a Semiclosed Rebreather. There’s these new units out now that are just 6k I’m been looking at but it’s hard to justify for me / to the wife… for what no bubbles hahhaaa..
The cool thing now I can go the
sheriff’s and join the
volunteer search and rescue team!.

I’ve got a buddy who does this Nor-Cal and he loves it!..
Trust me!, I’ve been a DAN member from DAY 1.. I even have their life insurance for 250K just incase something go wrong!..
The whole enriched air things scars me a little so I’ve been kind or passing on it.

I’ll need to get a new tank, reg & gages.. + I’ve heard horror stories about the gas being mixed wrong from the dive shops and not pretty.. I was trained using the tables and dive planner when I do multiple dives i.e. (first dive is always the deepest), wait an hour, then start over again, etc) as long as keep an eye on my nitrogen level use my dive computer I should be fine!.. at least that what I’ve told..
We should go give one day!.. That would be cool..
Have a great one!..
Shaun.