fishbeast, if you filet your catch on the rocks or the stainless harbor
sinks, it won't matter what knife you use 'cause the edge geometry on a filet knife is delicate. the thin plastic cutting boards (the thickness of matchbook
cardboard) are just the ticket and can be rolled or glued to the bottom of a fish drawer. bring along one of your old knives to cut through big bones.
how do you sharpen? the V sharpener from idahone inc., cs-4, (303) 838-4635, will put a razor edge on any filet knife, quick and easy for around $35.
fits in a tackle box. will not take off too much steel,used properly.
i don't intend to insult you with the above info, but i can't figure out how to thrash a knife in one season unless it's being abused. unless your fileting at an alaskan salmon canning plant. even the cheap, chi-com, black plastic handle, 5" stainless knives will do ok, properly sharpened, with 3 or 4 at hand.
bottom line, don't buy a good filet knife, unless you treat it with the care you'd use on a quality rod & reel.
the russel #179-7, has been with me for 20yrs.,thousands of filets, a little small for fish over 150 lb., carbon steel. i always sharpen after it's cleaned. for the salt i always bring a butcher knife to cut through the big bones. i friend bought me a cutco filet knife, that adjusts from 6" to 9", i can go from coho's to big kings or butts easily. the steel is just ok so far. i like the adjustable feature. i saw one in cabellas by another manufacturer. i hope this helped. $.02