I voted for A2 because it is affordable, tough, and fine-grained. I just purchased an aftermarket plane iron in cryogenically treated A2 at Rc 62. Easy to sharpen and holds a fine edge a long time. For a survival knife used for chopping, maybe Rc 60 would be better, but that is higher than many steels would be comfortable going for hard use. M390 was not on your list, but seems like a good candidate alongside Elmax for a stainless high end version.