Thanks for the tip, I'll probably give those selling suggestions a shot.
Thankfully I won't be short a vehicle as I can drive my SRT8 Jeep until the ///M arrives.
The only reason I haven't attempted to sell the 4.8is is becauase I need to know the exactly how much it will be out the door. Given the ecomony, etc... this purchase is a real streach, so every dollar counts. The only reason I'm considering this truck is because I've been waiting for an ///M model ever since I purchased my first X5 in '00.

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'98 Type R drag car ~1400hp
'01 X5 3.0 silver (sold)
'02 X5 4.6is silver (sold)
'04 X5 4.8is black (sold)
'10 X5 ///M Alpine White