I agree that some folks chase after the newer steels; that can represent an opportunity but also a risk. Some of the new steels are hard to buy and expensive, and heat treatment can be different. Plus, if you chase the latest and greatest be prepared for fickle buyers...there will always be later and greater.
O1 is a great steel, and a good overall choice. But maybe it might bear looking into some of the newer ones, too. Maybe for special editions?