The time has come for a new car and my heart says buy an RS4, Audi have given me a pretty reasonable deal on an unregistered car they have in stock and I am about to start the ball rolling. The only thing stopping me is a 335d, I have never driven one but the figures, on paper, are pretty amazing. I know it's not going to be as quick as the RS but it works out around £10k cheaper and I assume will be cheaper to run.
Do any of you have any real experience of both cars? I'm not going to do more than 10k miles pa in whichever I buy.
All comment welcome, try to keep things unbiased

Cheers
John