I like the Hultafors Heavy Duty Knife for general camp use.

http://www.heinnie.com/Knives/Hultafors-Knives/Heavy-Duty-Knife/p-92-913-6866/

Cost was about $7.

For an agricultural indestructible survival chopping knife the MoD 4 i.e chopping down trees, it is quite handy.

http://forums.equipped.org/ubbthreads.php?ubb=showflat&Number=221551

These knifes can be readily abused out in the wilderness without worrying about breaking an expensive knife.

For example splitting 6-7 inch wide logs for a fire is the limit of Mod 4.

Getting to know the limits of what your survival knife can do is probably more important than the model. Some very expensive survival knife bling have been known to fail badly even during light duty.