Thanks everyone for your feedback and thoughts. The 550 is definitely out. I'm going to test drive the X6 50i on Tuesday to complete my diligence before my X5 order goes in.

I've been warned by a number of folks that once I drive it I'll be sold.

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2011 X6 xDrive50i - Titanium Silver/Black Nevada/Bamboo.
Loaded except: Smartphone Int, Heated Rear Seats, Rear Ent, Lane Dep, SC Doors, 20" Wheels
2008 Aston Martin Vantage - Black/Black
Loaded