That sounds like a pretty good price - but, for the sake of all that is holy and X5, get a pre-purchase inspection done by a BMW dealer or solid indy who knows the vehicles. A "limited powertrain warranty" actually covers very little, and you need to be careful with a vehicle coming through the auction channel. No one anywhere in that channel has any obligation to fix anything, even if they know about it, before it gets to you.

__________________
2013 X5M - Sapphire Black
2006 X5 4.4i - Sapphire Black
2002 M3 Euro - Alpine White
2003 M5 - TiAg
2003 M3 - TiAg
2010 535i - Deep Blue Metallic
2007 530i - Deep Green Metallic