I searched this board previously to see if anyone had a good set-up but didn't find a ton of info. Well I finally made a purchase and I think it is a great set-up so I thought I would share. It will probably work on the E70's and my total cost was 20% MSRP for all parts so about $560 total.
I do hear some wind noise with the windows down but when the windows are up and the sun roof cover closed, I don't hear it at all.
It also fits great in my garage with almost 2 feet of clearance. I can open the top in the garage and it doesn't hit the rolled up garage. I live in a 6 year old Lennar home so most new homes will probably fit it the same.
Gas mileage on my last trip was still decent so I don't know how much it affected things.
I also used the Thule Setup that goes over the tire and it worked very well.
Here is the set-up I purchased. I especially like the ease and quickness of the set up and the new Aero style bars that are not square. It fits the length of the roof perfectly.
Rack Attachment - 450R Rapid Crossroad
Rack Bar - RB53 Rapid Load Bars
Roof Box - 689B Atlantis 1600 Black (has the new quick attachment feature and is quite aerodynamic. The company rep told me it was as good as the Spirt which is more expensive)
Matching Key Set