...a proper SRT-D Touring - ie. with decent big brakes (eg. from the petrol SRT), the Merc 4 litre V8 diesel, a massively better Sat Nav (although I think that's already a given from now on), and little bulges in the door pockets so you can slot one bottle in each door.
...mind you, I'd probably trade all of the above for Penny Smith (GMTV)

as a permanent front-seat passenger (sorry it's been a long day)....