an RS4 would be a great option. Otherwise, my list of possibilities would include 996 Turbo, A8 (old or new, Diesel or Petrol) and Nissan Skyline GTR.
Yes, I was thinking seriously about an RS4, but the newest ones are 51 plate (and very rare), and hence out of original warranty, plus from reading the RS4 forum I see they're due cambelt changes every 40,000 miles (my annual mileage), plus bigger discs, clutch liable to fail quicker than on S4, higher servicing costs, lower mpg etc etc. Most worrying of all are the posts about cars being nicked forcefully from owner's houses....as I mentioned, I can often be driving in the middle of the night through pretty undesirable areas; don't fancy becoming another crime statistic tbh!
996 turbo: never been a fan of Porsches, too "flash bastard", plus not 4 wheel drive and I would have imagined very expensive to run
A8: too big, not quick enough (apart from very expensive S8 )
Nissan Skyline: fantastic motor, but a little too "steroid" for me, poor mpg
You know what, I might just wait 'til the BMW 335d comes out next year: BMW sources are quoting 6 secs 0 - 60, 155 tops, 40 mpg! Working out the difference between that and a new S4, doing 40k miles a year, saving of £7200 PER YEAR on fuel!!! And that's working on today's fuel prices, which judging by today's news, are set to increase even bloody more
But, I just love the styling, poise, characteristics (apart from mpg) and overall image of the S4. Oh man, decisions decisions...