:welcome:

Expect to pay atleast $2000 under MSRP for the 3.0si.

I don't know if you are going to find and X5 with those exact options on a dealer lot, they tend to go quickly and most orders that the plant takes are personal orders. I don't know if they are still accepting orders for 2007, if I were you, I would wait a little bit longer for the 2008 model, which will probably have small minor updates, and possibly a 3.5si model with 300hp.
good luck

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