Awesome! This thread was worth posting for me. It's giving me options I hadn't considered.

Monroe OE Spectrum
Koni FSD, now called Special ACTIVE
Bilstein B4
Bilstein B6 (w/taller top mounts for rear)
the venerable Sachs

Poly bushings for front

Lesjöfors springs

I'm going to price out each of the strut options and see what I'm looking at.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim