Maintenance of the A6

I’m just looking for a new (used) up to max. 25k. I originally wanted to buy an almost fully equipped A6 (Quattro, TipTronic, air suspension, Keyless, ACC, standing heater, etc.) Facelift from Bj 09 with 3.0 TFSI or 4.2FSI engine (much short distance, max. 12,000 Km a year). But the selection of such moves in the promille area (seemed throughout Germany). Then I happened to end up at Phaeton (from GP2). This one has already included most of the A6 as standard equipment and the selection is huge. Are probably real shopkeepers the parts. Yesterday I would have spent the whole night researching whether the one in the maintenance is really so much more expensive. Inspection costs were to my aston were hardly more expensive than with the Tiguan (300-800 EUR). Wear and repairs have occurred with each car, but then I would be so much cheaper with the A6, if this is almost the same equipment?