I also own a 6.0 4x4, though I do love the power and throttle response, I too long to own a diesel.
The costs are much higher but the next truck I buy will be a powerstroke. Even though it wont pay off until beyond 100k miles, I truly believe I'll drive it for well beyond 10 -15yrs or so.
I'm not the most materialistic person, but I'm going to splurge a little on my next truck. I do quite a bit of driving and a small amount of hauling (hay now, soon to be cattle) so a diesel would be of good use for me.
I've seen some dealerships that advertise test driving diesels that have loads on the back just for that reason