Good to see another MBCLUB member on here

If MPG is of no concern then definitely go for the 5.0 S/C  2014 L405 SDV8 RR Autobiography

2012 RRS SDV6 HSE -Orkney Grey with A/B bodykit - Now Gone
2007 RRS TDV6 HSE - Zermatt Silver - Gone

On 6000 miles a year I'd seriously consider getting the S/C. Same spec as the TDV8 (might even be better, not sure) and more performance with fewer known issues. Cheaper to buy too. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

I've my TDV8 almost to 120k, it seems a very healthy engine, I've been attentive with fresh filters and oil twice a year. It drives amazing and I really really really love the car. I've got myself 6 lovely penalty points in the last 8 weeks with it but I'd never swap! Tried the v6 and it was too laboured. The car is 2 ton, needs a healthy engine to run it. Don't freak over the horror stories, they are there on any car.