Whats my 4.8is worth?

[TB151]

So my wife is pregnant and as the baby gets closer, we are getting closer to finally grabbing the right property. I have the opportunity to buy a Mercury Mountaineer from my mother for basically nothing, and it would be a good time to have no payments an no loan on my credit. This would also allow me to save up a bunch more of the green stuff.

So Im thinking of selling the X5 and figured this group of BMW enthusiasts would be a good sounding board for price suggestions.

Basically its a 2005 X5 4.8is. I just hit 70,000 miles, bought it with 30k. The car is CPO, good until 100k miles or 2011. It is fully loaded with every option except running boards and I had the $1k tow hitch also installed. For service, I have recently put in new a-arms, bushings, front air struts, window regulators, brakes about 15k miles ago, and it has new tires on the stock wheels. It was also recently alligned. I could also potentially include the winter wheels/tires and spacers.

Paint is perfect except for a scratch on the drivers door handle and a scratch on a small piece on the rear hatch, from a ski or snowboard touching it. Both pieces are easy to remove from the car, so no blending or anything else needs to be done. Leather is flawless as is everything else in the car.

So thats basically the story. I have looked around a bit and there are 4 cpo 4.8is' in the US for sale at bmw dealers, so not alot to compare with. The closest to me in Boston is in NY and at 41k miles they are asking $41k. I know thats not a good barometer of value, but it gives some ideas

Any thoughts are appreciated, just trying to get to the right number before i put it out there. Also, no pics as of yet. Its silver with cream interior with the sport seats.

Thanks guys, its appreciated