I've been using mostly the cheaper offering pine handled rapalas in the 6 & 9" lengths. I have a couple other ones that have been gifted to me. One thing I've noticed is that a lot of the fillet knives for sale these days are edge ground on one side only. I can work with these but I prefer a 2 sided grind, the one side blades want to draft or plow... the blade climbs one way or another rather that running straight through a cut. It can be corrected by tilting the blade a little, but I've started looking for this and I wont buy one with single sided grind.
I'll probably order one of the Rada knives that Walt posted, I've not heard of them but they sound like something I'd like.