For sheer variety of choices, Camillus has to be in the #1 spot. They have virtually all the bases covered, traditional and tactical folders and fixed blades, custom collaborations with great makers like Ralph and Simonich, high end knives like the OVB series, or at least high end for the production realm.
I love Marbles designs for traditional hunting knives , but their quality control and inconsistent management direction keeps them from being as highly regarded as they could be. ( I'm still sore at them for changeing from 52100 to whatever the stuff they're using now is)
Spyderco has to be on any list like this, for more reasons than I care to list, but the greatest of which can be summed in two words: Sal Glesser.
I don't have one yet, but wamp Rat knives are sure looking good.
There are a lot of good knives out there.