I think bushmattster has a given some sound advise. It is a good concept to start out with a larger knife (ready for immediate survival needs and self/home defense) and build around that base with smaller knives for skinning, bushcrafting, food prepwork, etc.
Couple that with an Izula as an edc/last ditch knife and you should be okay, especially if you get the Izula complete kit that has the fire starter and whistle, just add a small micro-light, like a Photon II or Photon Micro-Freedom, along with a dependable mini compass and you are really set when an emergency strikes.