I am going to get into shooting some sport photography, and I want to buy a new lens. I have been going back and fourth between the PENTAX DA Star 200mm F2.8 and the PENTAX DA Star 300mm F4 ...

my question is, do I go with a faster/less range lens or a slower/far ranging lens?

Is the speed advantage from the 4 to the 2.8 significant enough to compensate for losing range?

Also, does PENTAX make the best lenses for their products or can I find better lenses with Sigma or Tamron?