Pros / Cons for the S8

[1781cc]

Hey peeps, been a while since I've been here... almost 2 years since I sold my S8 for a more economical A4, its been a great car but I have a hankering for the big one again as I am no longer doing big mileage, so the dilemma...

5.2 V10 S8 D3 or 4.0 V8T S8 D4

Obviously theres a £15K difference in the main, but that aside, whats the pros of the D4 over the D3? I know what the D3 needs spec wise, I also know what the problems are with Carbon buildup, EBP, rear glass, power steering, etc.

All comments welcome, its a next year possible purchase, but just getting the bug slowly now