Here are your payments. As you can see, the 35d is significantly cheaper. Also, can I make one suggestion? Do not get the sand beige interior. If you like that look, you DEFINITELY want to get with Oyster. The sand beige makes everything beige - carpets, bottom of the dash, center console, etc. It is a nightmare to keep clean. If you go with Oyster only the seats are the lighter color. Looks much better and more modern, IMO.
2014 F15 X5 sDrive 35i (Carbon Black / Ivory)
Gone but not forgotten:
2012 E70 X5 35d (Alpine White / Oyster)
2008 E60 535i (Black Sapphire / Natural Brown)
2006 E90 330i (Jet Black / Sand Beige)
2003 E46 325i (Black Sapphire / Natural Brown)