Grit posted a good find for someone in the market.
Lot to be said for the old 8.1 gasser. May not compare to the new rigs in many ways but probably a good balance of remaining life, ability, entry cost, and opex. I'd be willing to guess that the old 8.1 has fewer computer chip/electronic parts to fail like happened on my 2009 2500HD with Duramax at about 120k....the iron is fine, but engine and tranny electronics all took a hike within about a 6-month period (8 - 12 different failures, one at -20 that convinced me to drop serious coin for a new rig).