Yeah I saw that, we started off thinking about an A6 All Road, but it looks like all Quattro systems do the business in the snow!
A8 is one i'd go for, cabin build on the A8 makes the Omega feel like a 80's Fiat 
The A8 is the nicer looking of the other Audis. I'm not struck on the Allroad, it looks like they ran out of paint to do the bumpers.

Yeah they remind me of the Renault Scenic 4x4 they did, which just looked like they stuck bits of plastic on

Ground clearance is not something we or most folk need on main roads, its better traction.
A8 Interior on the new ish shapes stays same too, outside had a refresh for that new corprate grill around 2005.
I really do like the centre console / gear shift area, everything just at reach with left hand, media controls, volume, ect. Huge amount of space for left foot, everything felt sooo solid. Media / Radio console was logical too, very simple to use.
Rear space is impressive as is the boot, those V8 TD's don't have shift and sound like petrol from inside!
Down sides will be when it does go wrong will cost a fortune, they are generally bomb proof