#4 above is what you have to decide upon in my opinion.

And you must test drive it thoroughly (it's an 07 and bugs may still exist). I know you said it was a corporate vehicle but in some cases you never know if someone just got sick of small issues and got rid of it.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr