the e34 will be much less of a bitch to deal with then a high mile e39, the m52 motor is really just a m50 with a slightly longer stroke to get it from 2.5 to 2.8 and if the oil's been changed in a timely manner the motor's fine at 200k, but it won't be as healthy as a m30 at 200k. i like the looks and comfortable seats of the e39 but that's about it, too much crappy plastic and cheeply made electronics (that and almost every e39 that's been through our shop i've put at least one head{one head and two motors in one} on it from it having been overheated)
all america wants is cold beer warm cat and a place to take a poop with a door on it