Full Face masks.
Dive Knife
Trilobyte eezycut
I just got one of those DGX eezycuts a couple days ago, but I haven't dove with it yet. The thing is pretty awesome, it's tiny, cuts 2x layers of webbing easily, and you can even manage a good grip using a combo of the handle & the velcro strap.
I also recently got some "trauma shears," which I find myself using on the surface a lot to cut stuff. They store on the BC a lot easier, lightweight, inexpensive, cut well, and less likely to stab myself.
Cheap torches
Retractors and other recreational tat
Big suit pockets -- changes your life! Two SMBs, reels, spare mask, knife, wetnotes. All fit in without problem.
Big, heavy 100m/330' reel with self-inflating SMB -- so much easier to put up from all depths. Just works without the faff of inflating one with your drysuit hose / regulator.
Octopus -- replaced with a simple necklaced backup on a short hose, with 2.1m/7' longhose. So much better.
Backmount -- replaced with sidemount if doing shallow open circuit dives
Open circuit -- replaced with a rebreather of course! A deep dive with helium for $30. Plus thousands for the unit and training ;-)
Cheap torches make good backup torches. I also use them for marking sites from the surface, tied to a float/anchor combo. Agreed on retractors, they never do what you want them to do.
Which "
Big suit pockets" do you use? I've done some fairly extensive modifications to my "sidemount butt pouch" and am always looking for ideas.
Self-inflating SMB sounds neat. I inflate mine using my alternate octo or alternate regulator. I recently wrapped my DSMBs in 18-ft of line, so it's one less thing to fuss with when shooting them from a safety stop. I can still attach them to my reel if I need a longer line for some reason.
Jealous of rebreather, but can't justify the cost at the moment