Never owned a 7 Series but have had plenty of BMW products and bar one problematic X5, they have all been very well built and reliable.
However, perhaps I could throw another option into the mix - have you considered an Audi A8?
We've had two - one V8 and one W12 - both lost us 50% of their value in the first year (so would have been a great 2nd hand buy for the next owner), but were great daily-drivers, had silly amounts of toys and imho, look very nice (not too flashy but set the right tone).
Just a thought
