These are all great suggestions. This knife is for my wife. We have an interesting dynamic at our house - my wife is very picky about the edge on her knives, but they get sooooo much abuse. I on the other hand am picky about edge abuse, but defer to her making sure the edge is as good as I think it is. *sigh*
It's not terribly pretty, and it's over your budget, but the VG-10 steel is probably a good upgrade for a fillet knife:
https://www.knife-depot.com/knife-296737.html
Fallkniven are good looking as far as I'm concerned. Glad you brought them back on my radar. That brand was on my list when I was searching for a camping/hunting knife. (limited EDC.) This particular one though is the wrong shape, and over-budget for the abuse it will get in my kitchen.
The Cabela's is too long, wrong shape. Same with the Schrade. Have one like that already, just not in SV30. Love the shape for everything from Northern to 1 lb perch.
Check this out for Dad's birthday: Leech Lake fillet knife made in Cedar Rapids Iowa. I have one. Works like a champ, though I still prefer the shape of the Cabela's. It has a sharp spine right behind the sharp flared tip. Great for cutting yourself with. Get it engraved with his name on it.
Something from Mora or maybe Marttiini?
Forgot to look at Marttiini - their Inox seems to take a nice edge. We have a small sheath knife for backpacking that I like much better than any of our various Moras, and I like Moras very much for what they are.
How about a flexible Victorinox/Forschner boner?
Close! The Victorinox looks like just the thing for my wife - it's shape closely matches the Rapala. Thanks chinacats.
(If that doesn't link right I'll fix it in a bit.)