Thanks everyone. Obligatory picture of said E70:
74k on the clock, ALL service records (all done at the dealership here; coincidentally, I worked at that same dealer in the past and that's where I picked up my last X5), 1 owner from brand new. Just put 4 brand new tires on it, so my next step is to get a spare in the trunk for the wife.
Before I purchased it, I did a lot of research on what common failure points are. Although I was taken back by some of them (especially people talking about transmission failures), it didn't really sway my decision not to get one. Shit, I figured if I could bring an E53 back from the dead, then an E70 with all documentation shouldn't be too bad. The only thing I am going to keep a real close eye on is that panoramic roof.
Any inputs from anyone who have had these outside of warranty?