Great report and info... thanks OP!
My wife's car a few years back was an X5 (gasser) and without a doubt that was the nicest all around vehicle I've ever driven.  It is the perfect size to be comfortable yet still compact enough to fit into tight places.  It has great visibility, the AWD is outstanding, the brakes were great and every other aspect of vehicle was just top notch.
We ended up having twins which put us one seat short in the X5 so we now have a Honda Odyssey.  We sure do both miss that X5.  I love to see the diesel engines trickling (albeit very slowly) into vehicles in the US.  Most Americans still associate diesel with the stinky, smoke billowing old "rattlers" of the mid 1980s.  
I'm up into 3/4 ton land to tow my TT beast but when I downsize someday into a smaller TT I'd have to take a serious look at that X5 diesel.  That looks like a pretty ideal setup.