Monaco Blue with Tobacco leather is the first color combination I saw at our local dealership here in Stuttgart. It was GORGEOUS!
Space grey is a beautiful color...but practically every other X5 on the road is going to be space grey...or black! Stand out a bit, and choose the Monaco Blue!
As far as interior colors go, we've seen black, beige, gray and tobacco, and an orangish looking color (saddle? terracotta?), and we both agreed that the tobacco (especially in nappa) was definitely our first choice. Unusual for us, because we generally have very different taste...