I have the full size Pika, and I have to say its great! Solid as a rock and it has a loud click when its locked...But I have also heard nothing but good reviews of the kabar dozier...some people argue its the best knife for the price...so its a tough choice!
In your price range, apparently, is also the Byrd line of knives, from Spyderco. Many users have found Byrd knives to be incredibly nice, especially at the price. The other two knives you mentioned are also considered among the best knives in the price range and certainly not slackers.