Update,
I tried every combo I could on Tirerack and the only staggered All-Season setup I could create for your wheels is the Hankook Ventus AS RH07. They stock them in 255/50/19 and 285/45/19. They don't show up as a replacement tire for the X5 when you set up the vehicle when you start searching, but I don't see why the would not work since they are the correct sizing.
My guess is that they are not a high performance SUV tire - they are an SUV all season, but aren't specified for high performance applications, which I'm guessing is how Tirerack filters the tires for the XDrive50i
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