The original REKAT Pioneer with drop point blade in BlackT finish. A little heavy to carry everyday, and not as smooth as others, but it's the most reliable and well-built knife out there. I also love my mini SOCOM with white handles and black blade.
Like Will Rogers, I never met a knife I didn't like, but I guess my favorite, perhaps because it is the only high quality custom I own, is the Polkowski Bodyguard. It is sleek, sharp, and comfortable. The three sheaths supplied with the Bodyguard makes it highly versatile too.
Since I have little experience with knives over $100, I'm kind of limited. I would have to choose my BM Sentinel combo edge, which I bought slightly used. It looks great and locks up solid with a cool "snock" sound.