Replacement shocks for a Ford 450 chassis C options/opinions

pauldub wrote:
Generally, new shocks will increase highway joint harshness. I think the Koni shocks that Ron mentions are the only shock available for our Fords that might actually be an improvement for harshness. Now we just need someone to buy them and report back.

I assumed that the stock shocks were not flexing as smoothly as they aged; they seemed much smoother when newer. Would there be other suspension components in play here that I should be looking at? I'd just like it to be like it was 50k miles ago!