Hi, all bro here. For 2007 X5 model should be the E70, and mine is E53 which is the previous model.
The E70 come with latest iDrive controller, and available third-row seating. The new engines are matched with a new electronically controlled six-speed automatic and an upgraded Dynamic xDrive AWD system.
Which engine are you getting? 3.0 or 4.8?
Any warranty from the dealer? if not, better get your mec to check the car. You may probably need to spend >10k to get it done for tip top condition.