Folders (manual assisted & auto): Spyderco, Kershaw, CRKT (KISS knives, some of their other "contraptions" are rubbish)
Fixed: Ontario, KaBar, CRKT, Cold Steel
If you're going for mass-produced, reasonably-priced EDC (every day carry), Spyderco has been the most consistent quality/value and their support is has been 2nd to none for me. I've *properly beat the ever-loving crap out of a native and delica and they just will not give up.
*Properly defined as using the knife as a folding knife. Not a pry-bar, throwing knife, staple remover, bottle/can opener, shovel, or a makeshift hammer nor any attempts at cutting materials known to be harder than the steel the blade is constructed from.