It's a mistake to get too caught up on Janka hardness in a board. Texture, grain, specific gravity, strength, and tangential and radial stability are all equally or more important. Many very hard woods are actually totally unsuitable for cutting boards due to being open grained, meaning large pores. Hard maple is as close to optimum as it gets; it's a 'hard' wood, fine textured, closed grain with very small pores, tangential stability approaches 10%, and specific gravity is .63. It is also very dense, weighing 3.3 lbs/bf. It's nice when your 18x24x2.25 board weighs 25-30 lbs and doesn't scoot around on your countertop.
As add pointed out be careful and research what you need. Boos and others offer cheaper edge grained products in addition to their end grained offerings. One's needs vary. In fact,'there are reasons behind smaller vs larger end grained pieces and patterns. My wife has different boards for rocking cut and drawing/slicing vs chopping for instance.
Good thread...
