Here is the thing: these engines are known to have the lower end go bad. Cracking in the main webs and crankshaft failure. Both of these problems are eliviated by less stress to the crank by a good balancer. Bad balancer = faster cracking of the main webs and / or broken crankshaft. Consider the balancer long term maintainence.
From reading a bunch of different info you find the doorman is the cheapest and averages around 75,000 miles.
The AC Delco is more money, and good on average for 150,000 miles. The fluid damper is a little more money yet, but no one has ever had engine failure from one on any engine they build them for, so consider it a lifetime part. These mileages are subjective, and considered the "safe" time to swap them out.
The question is how long do you want the truck? How much money extra are you willing to spend as insurance on a known major failure part. I grew up in Las Vegas, so I understand gambling, and once my balancer starts to show any wear, it gets replaced with a fluid damper.
