For me it depends on where and what I'm doing; in town I generally carry the swiss explorer, in a bad area Gerber exchange a blade folder, in the woods I really like Chris Reeves fixed blade survival knife(Hollow handle for storage, but not the "rat tail" tang design, its one solid 12 inch hunk of steel).
Now if you like throwers in my opinion there are only two choices; Case XXX 11', or Gil Hibbens 11' throwers. (I think they've been discontinued but they pop up on gunbroker from time to time.)
Double-edged Gerber mark III, I believe its called, hands down, if you can afford it. (I've seen them in the 400.00 price range and up.) SOG makes a decent version though for about 90.00.
All around favorite but illegal to carry in CA. and several other states, yet not illegal to own (As long as it stays at home.) is my Pacific Cutlery Balisong or butterfly. Pacific Cut. changed its name to Benchmark several years back, but they still make good quality blades.
I think I probably like knives as much if not more than firearms.