All 3 knives you've mentioned are excellent, in different ways. Without knowing what you intend to do with them, it's hard to give you a good answer. Please do answer marcinek's questions about what you plan on using your knife for, and what your budget might be.
Beckers start at a lower price point, and in my opinion, the handle is more comfortable, not that that stops me from modding it. I choose Becker over ESEE for the lower price and moddability. Many of us Beckerheads go to a number of steps to make our knives truly ours. For instance, here's mine:
I reground the guard and handle, and used the lanyard hole to make a BK11 style bottle opener and wire stripper, added bocote scales, reground the blade to FFG and convexed the edge, and reshaped the back of the blade to change the cutting characteristics. Mirror finished the blade and did some etching and patina work. Now it's really my blade. I know that people have done the same with ESEE, but I figure, if you're thinking you might want to do some work on your knife, better to start with a lower price point. As for the warranty, Ka-bar is amazing at taking care of their customers. The only people you find complaining, generally, are the ones who didn't even bother calling Ka-bar to see if they'd take care of the problem. So it's 6 up, a half dozen down, between the two.
At the end of the day, you'll get a great knife no matter what you buy, be it a Becker, ESEE, Fallkniven, or else something else like a Swamp Rat or a Bark River. My usual advice applies here as well--pick the one that YOU like the looks of the most, since that's the one you'll be happiest with.
I contour handles on a belt sander, personally, if that helps. I use the contact wheel on a 4x36 for most rough contouring, then clean it up by hand and with a dremel for sharper corners and curves.
