Do you want it for field use? Is light discipline a consideration? Go with the Nightfall model.
Do you want it to impress or to intimidate? Go with the San Mai model.
Here's what I recommend: Save your pennies and buy a Warcraft in 3V to use and a Master Tanto in San Mai III to admire. You'll thank me.
In my opinion, the Warcraft (any size) is one of the finest knives Cold Steel has ever made. Yes, ever.
-Steve