I agree with most of what has been advised so far and will reiterate that I think a good progression is OW, AOW, Nitrox, Nav, Rescue. You will cover the basics of search and recovery during rescue, so A full course may be a bit redundant…perhaps take that as one of the dives during advanced.
The first 3 listed above are key certs to have that open up the number of dive sites operators will allow you to dive, and nav will help with your general diving as well as help with rescue/search and recovery. After that, unless you wanted to teach I would recommend a GUE fundamentals course to improve overall skill set and reinforce buddy team concepts of diving. Of course you can always skip the PADI/NAUI/SSI/etc. recreational path and go with GUE type courses moving forward as an option.
-Z
The first 3 listed above are key certs to have that open up the number of dive sites operators will allow you to dive, and nav will help with your general diving as well as help with rescue/search and recovery. After that, unless you wanted to teach I would recommend a GUE fundamentals course to improve overall skill set and reinforce buddy team concepts of diving. Of course you can always skip the PADI/NAUI/SSI/etc. recreational path and go with GUE type courses moving forward as an option.
-Z