2008 BMW 5 Series 535i 4dr Sedan (3.0L 6cyl Turbo 6M)
535i Sapphire Black/Black with Sport & Premium. Simply awesome. Very well built, comfortable, fun to drive, quiet inside and bloody fast. Test drove an A6 3.2 Quattro and an E350 Sport. The Audi was really nice but felt a little underpowered (after driving the 535i). The E350 is a great passenger's car, not that great a driver's car.
Engine and suspension are head and shoulders above the competition. The 20 way adjustable seats sealed the deal.
De-Bangle the styling a bit and make iDrive even less intrusive - as they already have been doing since its introduction.