It is good that you are thinking about this subject. I, too would offer a few suggestions regarding your choices:

As a gen purp survival knife, drop points and clip points seem to be a little more versatile. Tanto points have their limits.

If you are looking at the Cold steel Survival line, the most popular seems to be the SRK. In Iraq, most soldiers prefer that knife to the Kabar or the tanto. I have two SRKs, which were with me a good deal of the time in Baghdad, and were effective as throwning knives against those pesky insurgent date palms that lurked around every corner. They are tough, well balanced knives that are just about the right size for gen carry. Since the SRK line is all carbon steel, the coating they put on the blade does help protect it from corrosion. In time it will wear off with use, or if you do as Chris and reshape the blade (as in convexing the edge), it will gum up the abrasive material, but this is not such a big deal. There are ways to deal with it if you need to.

One drawback of the CS recon tanto and the SRK is the tang is indented at the choil, which creates a natural fracture point on the hilt that is prone to failure during heavy batoning or prying. I wish CS would've either left the tang full, or swept the indent so there isn't such a dramatic bevel.

For truly duty grade survival knives, I have gone to the Swamp Rat line. They have an excellent reputation, though retail supply is significantly wanting due to the high demand and the limited production (Swamp Rat knives are made during the graveyard shift using the Busse production facilities). I have a larger knife of theirs that is perfect for splitting wood, lopping branches, fingers and toes, and cutting nail heads off of boards. Their blade edge and the girth of the body make it a truly survival tool, albeit a little bit pricey. You get what you pay for, and for as much knife as you get out of a $50 SRK, you get that much more, and then some, from a $130 Swamp Rat. I dare say my Swamp rat will outperform any khukri out there for similar tasks, and can do a few things I would never attempt with a khukri design.

You'll no doubt notice that no one is commenting on the Buck, and I will here. Buck makes good quality knives, and they are likely worth what they cost, more or less, but they are not the same caliber as CS, Kabar, Benchmade, Spyderco, Becker, or others. They are a lower quality knife; still usable, but not quite so reliable.

If you do go for a Khukri, I will side with Chris and recommend going native.

Good luck, let us know what you end up with.