Re: Thinking of the 523i
Just to look at things from another viewpoint. I was comtemplating a 523 as well but ending up getting a Lexus GS300 for the wife. IMHO, the GS300 trumps the 523 in performance (3.0L V6 with dual VVTi with 228hp vs 177hp, 300Nm torque vs 250Nm), specifications (adaptive xenon headlights, integrated bluetooth phone, touch screen, 14 speaker Mark Levinson hifi system, memory seats for both passenger and driver, keyless entry, autosensing headlights and wipers) and all for $10K less than the 523.
What it loses out is the handling, steering feel and being one with the machine on curvy roads. However, the handling is really not far off. The Lexus also has a prominent rear transmission tunnel (rear wheel drive) and is actually less spacious in the rear and boot. The Lexus is suprememely comfortable, so much so that I feel like cruising the long way home just to soak in the cossetting ride, comfy seats and hifi sound system (this is the only car I can enjoy classical music in!).
The Lexus may be Jap, and even a Toyota in disguise, but it is very reliable, heck of a value-for-money and the performance is really not far off from the 523. If your requirement is the ultimate driving machine, then BMW is it. If it is a blend of reliability, luxury, performance and adequate handling, then take a look at the Lexus. You get 525 or 530 specs at $10K less than 523 prices.
Don't flame me, I still prefer to drive my 320!