I just bought a Manix 2 that seems to be really strong. My first knives I bought when I just started getting really interested in knives were some benchmade autos, the last one being the Auto Rift(partially serrated), and they all served me well in my farm work. If you can't get auto you might want to think about Spyderco. I have never owned one, but I saw some benchmade bone collector manual open with spyderco holes and axis locks, made with D2 steel. D2 is great all around stuff.
The Manix 2 was my first Spyderco, and it is very well built! Although, the unlocking of the knife might be tricky with gloves. I usually use framelocks now, which is more forgiving gloves or not. But that company has a lot of types of locking systems! And a ton of great steels to choose from. The Manix 2 with S110v for under $100, great stuff!!
I have lived on a farm since I was born. It is really useful to have a one hand open and close!! Really useful!! That is why I used to love autos, not I moved towards flippers.