I own an '06 with the M54 3.0. I have 268,000 miles on it. It is my daily driver. I have put as much as 30,000 miles a year down to my current 10,000. There have been some on this board with over 300,000 miles. It is a great daily IMHO. As long as you get a good price, with only 100,000 miles I think, if you're realistic and it sounds like you are, they're good cars. I love mine. Your list of work sounds like the items that should all be addressed in an X5 of that age. I would add a full suspension refresh if none has been done by the PO. Those parts are only good for about 100,000 miles, especially the rear ball joints. You can also expect the oil filter housing to start to leak and eventually the pan gasket. My pan gasket is leaking and I have to replace it, but need a big block of time to do it as it is a PITA and not a job that I would pay anyone to do as it will probably cost more than the X is worth at this point. I would also take a look at the motor mounts. Good luck with your new ride!