Hi. I think it all depends on what the car is worth to you as a relatively cheap runaround with regard to ongoing reliability risk and the will to keep it on the road. The 2.8's are not going to see the following and desirability of the 4.2's and they are not going to be close to the cache the S8 holds in peoples minds. Shame.
Any A8, in my mind, is a superb car but they need a lot of tlc to get the best out of them. My 'baby 8' has spent most of the last 13 years on the drive as a tinkering project. Around £1500 for a relatively up together 2.8 A8 seems a good price to achieve. But that's just the price of a high(ish) end PC. If you like it, its going to give you a years worth of trouble(ish) free motoring I would keep it.
Nice colour!
