Yes, we love the Silverado with the Duramax. But ... ask me one day when it needs an injector, turbo, fuel pump ... and I have to sell plasma and blood to pay for it. Might have a different answer then.
I'm in the same boat as you. Wendy won't drive this truck; especially since it's a DRW. Takes a little getting used to. Do this Dan. Take her to a dealership and drive a non-dually 2500HD and see what she thinks. They're not much larger than a 1500 and it's a really nice feeling sitting up higher with the better visibility. You'll never know until she drives one. With the new Duramax coming out this fall there are some good deals to be had on low mileage LML Duramax packages.