I "vote" for sand interior. Our 3.0 is Topaz (although we renamed it "Lapis") with grey & light wood. We like the dark/light contrast of the blue & grey or sand. (The 525 was calypso red w/ the light grey interior they offered 10 years ago. Great contrast.) Today in Burlingame I saw a silver 4.4 with black interior & sport. To my eye, the interior was too dark. BTW, beware those who make absolute statements about aesthetic issues like this. You have to live with it, so get what you want. (However, IMHO, my color combo is the best!) Please give me your opinions on how Topaz looks with either the Sand or Black interiors. The interior will also have wood trim.