Depends on where you live. Here in Tampa, Ive hardly seen any X5s in silver. Ive seen all black, blue, and white.
Silver is actually not so common as it use to be. Since the X5 is not available in Montego or lemans blue, I decided to get the silver myself.

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12 X5 3.5i TiAg Cinnamon, Bamboo, Convenience Package, Sirus, Running Boards, Spare, BMW Apps MODS Perform Grilles, Painted Reflectors, GP-Thunder II Fogs, 3M Bra, Side/Rear Window Shades, Black X5 Emblem(Sides Removed), Black OEM BMW License Plate Frame