It's not pricey, but a Queen Country Cousin is currently my favorite. D2 steel, and my favorite pattern as far as slipjoints go. It's simple, but I really like it. I also like my new Mcusta MCU33D Take, if only because it looks so good. Out of that list, though, I'd choose Kershaw. The OD1 is a great knife, and I prefer it to the other brands listed out of the admittedly small number of them I've tried.
My favorite folder ever has been the Strider/Buck tanto with the four inch blade. Seeing as how Buck doesn't make that particular model anymore, I'll go with the original designer. But, I've liked all of the Kershaws I've owned, all of the Emersons I've owned, and I owned a really nice Camillus Aftermath, but I voted Strider.