I am looking to buy X5 35i (2012) with
Jet Black exterior
Sand Perf. Nevada Lthr
premium pkg
convenience pkg
premium sound
Active vent seat pkg
Multi contour seats
smart phone integration
running boards
heated front seats and ventilated front seats
bmw apps
3rd row seats.

I haven't bought BMW before. Please advice me on what price would be a
good deal while bargaining. I am in Texas.
Also I am confused if i need to go with diesel. Any advice on that will be appreciated.
Thanks