I just use our old Rada stainless steel kitchen knives. For many birds they have to be sharpened a few times in between, but they serve the purpose well and I don't have to struggle with poor cuts...and I don't have to buy any special knives. That's the best part!
They last forever and they are reasonably priced...and they even make hunting/fishing knives for tough stuff:
http://www.radacutlery.com/kitchen-knives
That's what I use - one for fish. It's okay, but his knives cut flawlessly. I sure would love that easy of a cut!
I don't mind spending the money. I just wish I knew what they were.
