In case anyone is wondering, 154CM is the American steel the Japanese cloned into ATS34. They're very similar, the heat-treat recipe is the same but many opinions seem to put 154CM fractionally ahead in performance.
It's a fine choice for a blade this size. Depending on heat-treat, 440C can actually be made tougher (in "pry-bar" terms) but it's a BEAR to sharpen in comparison. TRUST me on this!
Jim