We have not received any X1's in the US yet but if your just looking for opinions I'd go with a black interior. I ordered beige for my white X1 but only because I'm in South Carolina and the interiors get so hot here in the summer. I would have loved the Terra interior but it wasn't axailable on an sdrive. I had that color on a 2004 X3.
1995 325i,1996 328ci,1997 528i,1997 Z3 2.8,
2001 X5 3.0,2001 330i Conv,2002 M3 Conv,
2003 M3 Coupe,2004 M3 Coupe,2004 Z4 3.0,
2004 X3 3.0,2007 X3 3.0,2007 335i Conv.,
2013 X1 28 sdrive M Sport, 2014 M235 on order