From memory you might struggle to get 20 x 10 wheels on the fronts due to impeding the suspension members, take a look at Audipages HERE for some advice. The widest Ive seen at the front is 275's on a 9 inch wheel so 10 inch is a huge increase, may be a suck it and see job so try bolting the wheel on before you buy the front tyres! Rears can go much wider, my rears are 295 25 21 on 10.5 inch wheels whereas the fronts are 255 30 21 on a 9 inch wheel.
The final editions are 9 inch wheels and Ive got 275's on mine all around when I put them on but if youre lowering the front down like I have on coilovers then be prepared for some adjusting or put up with some rubbing! 
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Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee
20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble 
Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior
Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble
Audi A8L D2 4.2 Petrol with LPG - Ebony Black
Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black
Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior
and some other A8's A8L's and Mercs
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