knife recommendations?

Having done my first full field shoot including unmarked, one of my kit difficencies is a suitable knife for getting arrows out of wood.

Obviously this isn't something I plan to do on a regular basis, but as the Tom Lehrar song goes "be prepared!"

After the wonderful run down of what i should be looking for in a new pair of pins (that work amazingly) I'm hoping for something similar to that when it comes to knives.

Thanks in advance