Nice truck for sure, but I too am in the diesel crowd lol. My dad has a 2010 with the 6.7 Cummins, and it's been a great truck. He's got 55k on it already, with no issues at all. The hemi is a good motor, for sure, I just don't think 3/4 ton and 1 ton trucks should ever get gas motors when there is a diesel option. Mileage is better and so is power and towing capacity.
All that said, my dad's previous vehicle was a 2006 Charger with the hemi, and he put over 100k on it w/ no issues AT ALL. I did the plugs on it myself ( all 16 ), and although it took a while it's not a tough job. Keep the filters clean, change the oil on time and maybe consider a catch can setup, and that motor should give you many trouble free miles!
Congrats on the purchase :)
Also, here's my dads: