I'm going through this decision process now. Having driven both, the D is nice and smooth with lots of torque, but isn't the 5.0 by any means. If you can live with the bad gas mileage and the uncertainty around the longevity of the N63tu engine (since the N63 had known problems) then the 5.0 seems like the way to go. I usually buy, but may end up leasing this time around, giving the risk to the dealer. For now I'm leaning towards the 5.0, but I'm waiting until the UDE in DC to decide which and buy.
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