i would think that it would be helpfull to know what environment you would use the knife in jungle, forest, desert, what are your anticipated tasks, you might find that the choices are bewildering, there are so many manufactureres, custom makers, and different blade shapes, lengths, diferent sheaths. a lot of the choice has to do with your skill level, the more skills you aquire the less gear you need. i have never broken a knife in normal use on different camping/survival/ hunting trips. most brand name knives will hold up to tremendous abuse, from the swedish army knife to the kabar marine corps bowie, to the cold steel SRK, these knives are inexpensive and pretty robust. the becker line of knives are also built pretty tough, the RAT series developed by jeff randal are also pretty robust. then you get into more expensive knives like the busse, tops, rat,fehrman all very good knives. then all the custom makers many of whom's knives we see posted here.
you would be well served to get a machete, i like the cold steel machetes, a small axe, a camillus marine corps bowie, a swedish army knife, a rucksak or one handed trailmaster swiss army knife, a cold steel SRK, and try these out for your needs before buying a custom knife or dropping a whole bunch of money on something you find does not suit your needs. your preferences and needs will surface as you use each of these knives and you will see what is most usefull and what you can leave behind. there is no "best" or "perfect", the answer is what fits your style.
alex