Gen III Hemi Prices

But there not really a true Hemi like the Gen1. Gen 2 is a lot better than the 3's. First I'm hearing about dropping valve seats. I guess I'll have to ease up on my 05 Ram Hemi, no more beating up on it. Any body have a time line on when destruction begins with them? I only have 80,000 on it so I would think 100,000 would be the magic number.
from what ive researched, some as early as 20,000, others 180,000, usually after it overheats or from detonation with bad gas