How do I find the right serpentine belt, tensioner and pulley for my truck? or what is the best combo set for the money?
As long as you know the answers to the various questions that online catalogs use, you'll usually come out with the right part. Know what style or amperage alternator you have and whether or not it has AC. Know if your truck has Federal or California emissions. That will usually do it for the majority of the 1/2 ton trucks. Special options like police, ambulance, or plow packages can make a difference.
As far as "combo kits", anything from Gates, Dayco, Goodyear, or Continental should be fine. I personally prefer Gates, but any will suffice.