2008 BMW 5 Series 535i 4dr Sedan (3.0L 6cyl Turbo 6M)
The 535i has enough power to make it a performance car. They don't give you a lot (compared to Cadallac and Infiniti, etc) and the options are borderline ripoff, but what they do give you - fantastic. The 20 way sport seats and iPod adapter are worth it!!!
Optional 20 way seats. Engine.
A few more memory (radio and phone) buttons and allow start engine button to not require fob in steering column (a $1000 option). It's awkward and most cars of this class already have it std.