Kevin.303:  Welcome to the KCA forum.  (You must be a Lee-Enfield fancier)?
  If you posted some pictures of your Pacific and model 1896 Krag sights, it would be easier to give you an estimate of their value.  There are two models of Pacific 'no-drill' sights:  K-1 and K-2 (micro elevation & windage adjustments).  The Pacifics seem to sell for around $65 to $90.  An 1896 Krag rifle sight generally seems to go for $35 to $55.  Condition controls desirability and price.  If you search Ebay for 'Krag', you will generally see these items for auction.

Most U. S. receiver sights have the same thread for their apertures.  Williams, Lyman, and most Redfields will work.

Generally, having a Krag receiver drilled and tapped is a mistake.  It is not hard to find a Pacific K-1 or Redfield 102-K 'no-drill' peep sight.  Just be patient.
  Personally, I prefer the Redfield 102-K.  It is the most convenient for raising and re-setting the elevation staff for easy bolt removal.  (The coin-slot screw is slightly loosened, the elevation slide can then be fully raised, friction will hold the slide 'up', as the bolt is removed normally.  The set screw allows return to previous 'sighted-in' setting).  For hunting, especially in brush, the screw-in aperture is normally left off for improved field of vision.

Nice sights:  realistic values would be around $90 for K-1 Pacific and $65-75 for model 1896.  IMHO

I have not noticed a tendency for Pacific Krag sights to have bent rods.  The actual rod-end, that goes into the sight body, is smaller in diameter and slightly off-set, when compared to the rest of the rod that enters the magazine cut-off hole in the receiver.  The rod seems to be a 'press fit' into the sight body.
  If the rod is bent, it is probably because someone pounded on the Pacific sight to remove it from the rifle.  It can easily be straightened.  There is no need for hardness in the rod.  When the Pacific sight base is locked into place with its Allen set-screw, there is little stress on the rod.