I used to carry a Spyderco Delica for years before the clip broke. Once I locked myself out of my car and had to use the Delica to pry the door open just a little so I could get a wire down and pop the lock. Although the knife didn't break, I was worried that it would. Never liked that feeling so now I carry a Mission MPF Titanium Folder. Lightweight, extremely strong, corrosion proof, and carries no magnetic signature.
A little pricey at first, but not for something I plan to trust my life too and pass down to my kids.
If it's good enough for the Seals, its good enough for me.