Intermediate levers for the N62 could be a problem if you live in a cold area. They have been known to require replacement as early as 60,000 miles. I think part cost is 2 to 3,000 and man hours could be close to 40 hours. So you could be looking at 5 to 8,000. If you have the water cooled alternator in the X you better be sitting down when they tell you what the part cost without the labor.
Only you could decide if it worth the additional cost for a CPO car, perhaps the dealer will make it a CPO car seeing that it only has 50,000 miles.