My preference in blades would be a Tanto. They just seem stronger tipped and easier to thrust. I have always loved the K-Bar size and strength though. Do they make a K-Bar Tanto? I like the K-Bar fighting knife grip but I would add flatter sides for grip and a small ridge longitudinally for orientation. It would let you know which way the blade is oriented at all times and wouldn't hinder the handling like finger grooves would.
I also agree with Cowcatcher on the ring.
I also agree with Cowcatcher on the ring.