I had to look outside the box 
Found a set off a 350z in California.  The width and offset are perfect for the S6/A6 4.2.  18x8.5 front et24, 18x9.5 rear et24.  Ill have to use wobble bolts, but I already have a set and used them many times before with no problems.  The 5x112 18x8 size is too narrow for my cars, and the offset in that size wasnt great, and would need spacers.
Apparently, BBS lists the weight of the 18x9.5 at 21 pounds, but the actual weight is 19.8, verified on two different scales.
The set I got comes with 255/35 front tires, and 265/35 rear.  Eventually Ill change them, but should be fine for now, since they are within 1.1% circumference, and the rears are probably worn down slightly more than the fronts, coming from a rear wheel drive car.   When I purchase a new set, Ill go 265/35 front and rear.
The other nice thing about the 5x114.3 wheels is that the aggressive offset results in a deeper center hole.  I like the look better anyway.
http://i33.photobucket.com/albums/d59/gambel/P1040488.jpg
http://i33.photobucket.com/albums/d59/gambel/P1040410-1.jpg
http://i33.photobucket.com/albums/d59/gambel/P1040405-1.jpg
http://i33.photobucket.com/albums/d59/gambel/P1040485.jpg
http://i33.photobucket.com/albums/d59/gambel/P1040483.jpg
Seller wouldnt ship to Canada, so I have to drive to Niagara to pick them up.  I figured it was worth the hassle considering the rarity of the wheels.