Buy brand new so u don't get one someone else has put the "100hp" chip in it. And screwed it up. The new dodge interior are amazing. I got a 2012 3500 ram mega cab and couldn't be happier. Don't plan on modding or lifting, and haven't heard anything bad about the new 6speed auto.
Ride is nice, leather is top notch, and fit/finish is great compared to previous yrs. and dodge doesn't have glow plugs, there's an intake heater but its fast.
The built in engine brake and trailer brake controller is awesome and looks nice. Don't have extra shit hanging down to hit ur knee on.
Mpg... 11 towing, 16 mixed driving. And I got 20 only freeway using cruise control.