After 41k in 18 months.. (B6 not B7 but hey)
I really like the auto-dimming mirror - but then I do lots of motorway miles at night..
I also really like the automatic headlights - would choose that again
I like the Symphony, partly for the in-dash changer, partly because I prefer the look of the console without the cubby hole (though a mate has the opposite view)
Cruise, unconvinced - had it on previous cars, on the lots of motorway miles theory - but british motorways dont really make for prolonged periods at a consistent speed, and I dont miss it at all on this car
Parking sensors -aargh! a pet hate, when I get in colleagues cars with them, would be offputting to me unless i could turn them off - though I accept some like them
I like my armrest, though I take ScoTTy's point - I tuck it out of the way sometimes, have it down soemtimes, use it for non-rattly storage a lot - I would keep it.
Would possibly choose the DIS - my 'sport' doesnt have it, and the ONE feature I would use it for is the permanently set upper speed alarm - the non-dis cars you have to set this each journey if you want it, not much use. With the DIS, I would leave this set at (ahem) 90, just in case.. not that I regularly catch myself over that at all... ;-)
Think the standard lights are
Cr@p, so Xenons would be a nice feature - though Im very happy with my lights now Ive fitted silver star bulbs (and saved a packet compared to Xenons!)
I WOULD have the built-in bluetooth - my aftermarket car kit works well, but I think it spoils the look of the dash somewhat, and lets face it you spend a lot of time sat in front of that dash..
Split fold rear seat - YES YES YES YES YES YES YES totally agree with macduff this should be standard, and is a massive frustration not having it on my saloon..
Interior light pack - yes, for cool factor
Electric rear windows! Cant believe this isnt standard on what is an upmarket car - think winders look so naff now, and very happy to have electric all round on mine!