Ready To Buy - Your Thoughts

[BUCKBEAK]

Have test driven the MB GL 450 & 320CDI, Audi Q7, Acura MDX, Lexus 350 & X5.
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We were blown away by the X5.
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I liked the MDX and for the money it leaves a good impression - but not in the same class as the X5. The MB 320CDI get excellent mileage and solid ride - but just dosen't connect to the road nor excite.
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So my wife and I are sold. This will be our first BMW. I currently drive a
VW Passat 1.8T and purchased it for the same reasons we liked the X5. (A poor man's 325i).
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We are looking at a Space Grey 3.0si, Prem Package, NAV, Heated F/Seats, Black Nevada, 3rd Row with the Roof.
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Sould we expect to pay MSRP?

Thoughts Appreciated.