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+1 for the Halcyon Ti knife.
I have two of these - one on each of my single and double tank rigs.
The knife does everything I need, doesn't blunt or rust, takes up little space (on harness waistband) and is amazingly sharp.
I've used in on numerous occasions - cleaning nets and line of reefs and wrecks. The best example I can give was when I had to deal with an incident involving a fishing boat that was dragging anchor across reef and endangering my divers. Two quick swipes of the knife severed the 2" plastic anchor rope. Very impressive!
There's just no need to spend more money on any other brand of knife....