It is a $40,000 vehicle, so I wouldn't go cheap (what if you burn out the whole circuit board?).
Personally, I would buy just one OEM bulb and see how things look.
I am fortunate to have unique press cars delivered weekly, but I own:
'13 Audi Q5 2.0T Quattro 8AT
'86 Porsche 911 Turbo 4MT
Gone, but never forgotten... my E70 X5 35d, E90 335i, E46 330i, E36 328i, E70 X5 3.0si, E53 X5 3.0i.
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