After my fiasco the other week sliding around in ankle deep mud, I have changed my mind about using my road shoes for off road as well and thought I had better get some trail shoes.
These are Asics Fuji Attack 5. They were heavily discounted as a later model is out. The reason I chose them is that the soles are apparently harder wearing than many trail shoes, so can be used partly on the road as well, which is essential for me as I have to negotiate quite a bit of road to get to off road areas. They are also lightweight, have lugs facing backwards and forwards for going both up and down rough terrain without slipping. They have a rock plate too; and although I don't expect to navigate many boulders round here, there are some very deep ruts that are rock hard in summer, plus lots of tree roots.
Oh, and a neat little pocket on the tongues for tucking in your lace ends.