Unless your car is black, then definitely go with the titanium/sliver girlle, it has a much classier, luxurious look to it. It's the first thing I changed on the X5.
BMW E70 X5 Genuine TITANIUM Hood Grilles 3.0 4.8 07-up: eBay Motors (item 390154876757 end time Nov-06-10 10:28:02 PDT)