I can tell you that my X5 is a 2005 4.8iS full option and it is great but....

You will find that the late 04 to mid 06 4.8 n62 can be a PITA for "certain" issues popping up. I still wouldn't want lamb roller unless it was an old defender 90 (last LR you could fix with gum and baling wire)

Go with the X but check these posts to lessen your chances of putting some mechanic's kid through an Ivy League school.

https://xoutpost.com/bmw-sav-forums/...e53-today.html

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course