Looks like a lot of similiar thoughts here. My five are:
(1) Buck 110
(2) Case Redbone Handled Stockman
(3) Victorinox - Soldier or something like a Tinker, Climber, Hiker, etc.
(4) Buck 119
(5) Good multi-tool of some sort
Just five definitely make it tough and there needs to be room for a Kabar, good machete, Case Trapper, whew the list might just be never ending!