Newbie asking for advise on a used X3

[Echo7]

Okay so here it goes...

I have test drove a 2004 X3 with 49k miles...a couple of things i noticed..
Moonroof has pronounced wind noise over 40 miles an hr.
When I started her cold and reversed ..she shuddered a bit. Sales guy states it because she was cold . Once warmed up the truck did not do this. The car dealer is asking $13900 and they had it at 14900. Can anyone tell me if this is a good deal. I did have them check the vin# through BMW and no major things...also one owner and some sensor that were replaced early on. Please advise on your thoughts ..I am needing to make a decision.

Regards to all

Echo 7