Self leveling rear suspension comes "free" with 3rd row seats in the 6 cylinders and comes standard in the V8. Strangely there is no difference in price for 3rd row seats between the two cars which is odd. So you already have it (but double check with your SA).

I wanted to get the self leveling suspension for towing but not the 3rd row seats but it doesn't appear possible to get it by itself in the 35d. Let me know if anyone finds otherwise.

I like the sports package (SAV) but I don't think I'll bother with the multi contours. Always found the standard or sports seats were great. Maybe it's an age thing (in my 30s).

Keep in mind that the SAV does not change anything about the suspension, just wheels, steering wheel, trim, headliner. The adaptive drive option is the closest option to a sports suspension but at $3185, not sure too many folks will get it unless they're getting the M package (ZMP). The ride is already stiff enough stock I think.

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1995 BMW M3 (Track prepared)
2006 BMW 530xi (Wife)
2011 BMW X5 35d (Tow/Daily)