Spyderco, Benchmade, then kershaw for me as well.
Spydero knives have better ergonomics, are very comfortable to carry, and have fantastic blade steel.
Benchmade has good designs, great blade steel and locking mechs, but they are usually over priced.
Kershaw makes good stuff, however, recently they same to have some strange designs that look more appealing to the eye than to the hand. Plus, I HATE those fugly composite blades. Assisted Openerss used to appeal to me, but I think they are more of a fad. I can get my Spydies and BMs open just as easy, plus you don't have to worry about torsion bars breaking. I do need to try this new sandvik steel they uses. I never have so I can't say anything about their toughness, edge retention, ease of sharpening, or corrosion resistance. I like the looks of the ZTs, but I think they're a little too pricey.
O my.. wait till the Kershaw Mafia shows up