Your list of possibilities is incomplete, but perhaps you're just interested in relatives votes from among that list. I like the STOS -- for flight, strength, and long slender shape (superior penetration). I also like the Eclipse for the Teflon coating. And I'm trying to learn to work with Grizzly, which Dr. Ashby rates as the best factory head for penetrating heavy bone, like an elk scapula. But I swear, that Griz 160 is the dullest factory head I've ever encountered, sharpening a single bevel is difficult (and even moreso if you take it down to the 25 degree bevel Ashby recommends) and the steel is hard. Also has a slightly rough finish (just opposite the Teflon Eclipse) that requires polishing. But I'm determined to come as close to all of Ashby's recommendations as I can this year, within the realm of woody arrows (he uses graphite to get extreme forward-of-center balance) and see how it performs on elk. Dave