4 is a great choice, I went with 6. Dumb, barely used it, been a couple years now, just havnt bought another ESEE, because I can do everything I need with a smaller knife, and better, I like whittling.
>>27974821095 is a good carbon steel for outdoor use, in my opinion, just gotta oil it and not leave it in a puddle of salt water
ESEE 5 holy shit don't fall for the "sharpened pry bar" thing, like the becker bk2. If you want a knife, buy a knife, if you want a crowbar buy a crowbar.