As you stated, what interests you most is what is going to keep you diving so that is important.
For instance, I love going deep and am actually doing the PADI Tec-Deep courses now for diving deeper than 130’ and making decompression stops, but that definitely isn’t for everyone.
You can always tweak and fine tune your buoyancy so that is a good course.
I also love night diving and most of our inland quarry diving is limited visibility so if you think that is an interest that one is a good one to check out.
Boat diving was one of the last certifications I got just b/c you can go diving on a boat with just your open water card so other than knowledge you don’t gain anything from it (in my humble opinion).
Have fun and I think we may be coming down to Vortex that weekend from Nashville with a group. :-)