Dennis,
I hope you consider a fillet knife made from S30V. I know the cost is higher but you will not have to sharpen the knife as often as you would a 440C knife. No kidding. I bit the bullet and purchase two fillet knives at the start of this year, both made from S30V. The first knife went to a fishing guide, who almost fishes everyday of the week and after a month of filleting 2-lb to 5-lb trout, well over one hundred and twenty fish, and the knife is still working very sharp. His old name brand fillet knife needed to be sharpened all the time after three fish. And the old knife has now found the bottom of the tackle box.
My own knife is only used a couple times a month for trout or salmon, with a 10" blade and a 6" stabilized koa and cherry wood handle its purrdee and sharp. I would not trade it for anything. Oh, these knives, were made by J.P Holmes custom knifemaker.
Jeff Pelz