I've owned the Skirmish, Manix, Military, and SERE 2000.
I'd forget about the Skirmish, it's big, beefy, beautiful, but it's a reproduction of a custom, not really designed for all-around utility.
The SERE 2000 was almost perfect, the only disappointment being the liner lock, which I found to be weak. It didn't fail, but it gave with too much flex.
So now we're left with the Manix - a sturdy lock-back, and the Military - the firmest liner-lock I've ever used. For them I'll just say this: I always carry a knife, and really like the Military.
If I needed, however, to always use a knife, I'd choose the Manix.
These are just my biased, unprofessional opinions - no matter how correct they might be :jerkit: