KYB or Bilsteins
I learned about KYB in the early 70s for use on Volvos. I also know about Bilsteins too. KYBs are great shocks and I would put them on my truck any day but as far as I can tell... they are not available for a 2500 so, it's Bilsteins for me.
KYBs are way less money and, IMHO, almost as good a shock.
-Paul R. Haller-