don't listen to the people who are telling you to buy a ka-bar over a gerber lmf2.
I currently have an lmf 2 and two 2 ka-bar knives. the ka-bar is a great fighting knife but impractical as a survival knife.
the Ontario stuff is good also... but is too over rated in my book. the only real plus for the Ontario stuff are the micarta handles. I have an rd6, which is a good knife, but comes with a crappy sheath. so, unless you buy Ontario's more expensive brands (esee, rat) you get a crappy sheath.
the mora classic is one of the best blades in the group but it has a cheapo wood grip and doesn't have a full tang.
of all the knives suggested I would personally go with the lmf 2. it has a good blade, nice comfortable grip, good usable features, a built in sharpener, and a good quality sheath.
the ontario stuff is a close second, but they are simpler knives and don't have the features of the lmf 2.