Those wheels are not the best quality and probably should not be put on a BMW, but its your ride. I say stick with factory style wheels, lots of styles.

Found this on ebay. Not a fan of chrome, but just gives you an idea of pricing.

20x9.5" 20x10.5" Wheels Fit BMW X5,E53,Chrome,#87:eBay Motors (item 390058432973 end time Jul-10-09 10:53:40 PDT)

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2002 X5 4.6 Sold
Dinan CAI, TB, Mass Air, Stage 4 engine & tranny software, X-pipe
2004 745Li
1997 Ford Mustang Cobra Vert
1985 Mazda RX-7
13B-REW single turbo 60-1, Haltech, Meth injection, MSD Ignition, and much more
2008 Mazda Speed3 Hypertech Tune