I'm glad the truck is working out for you. I had the option to go with the 4.7L but it was a new engine when I got my truck and wasn't as powerful as my 5.9L is (it's close though). The dealer gave me a good deal on it too. I've never taken it to a dealership for maintenance though. I've had some tsbs done on it, but I always take it to my buddy's garage for most stuff. It's been great so far too, just the usual brake pads/tires/oil changes.
You shoulda got a Cummins

Although, depending on when you bought it there wouldn't be any rebates, unless yer lookin at a 2nd gen model.