Got the 6.6 Duramax with the Alison 6 speed, only way to go! Did my Consumer review research and found Chevy diesel rated the best all round of the Big 3 for 08'! Can't even complain about the mileage. Adverage of 18 mpg, 21 mpg at 55-60 crusing the interstate (unloaded). Love how the Alison tranny grabs hold of the engine when the tow mode is turned on and sounds awesome. I got he 17" rims with my truck which I highly recommend.
Bose speaker system, interior design has all kinds of room and is very attractive yet tough! Rubber floor mats was an excellent idea. Remote start for the cold mornings and hot days!
Wish the 08 had the back-up camera which I see now is availible on the 09. I agree that a 4X4 indicator light in the dash would be nice.