For boning out a salmon nothing beats the Cutco, but for actually cutting up the fillets nothing beats a good Dexter Russell Salmon slicer.
The boys at Sturgeon Pauls like this one for Salmon work. Good on back fin, breezes down the back bone and appears to work well filleting the gut bone from fillet'd halfs. Been thinking about getting one.
Currently use an stiffer 10-11" fillet for salmon - works nicely. I agree with the long blade for less passes opinion. Little stiffer blade gives more controll and requires less effort for me. Good quality for longer time between touch-up.