Get service history if you can. My car had so much replaced that it Meade my eyes bulge reading through all the pages. I'm glad the previous owners took care of everything at dealer.

I got it with 77k miles. 2006. 4.8is.
I've replaced the following.
Window motor pass side.
Trunk latch mechanism
Engine mounts
Thrust arm bushings

Navi screen needs replacing
And I needed new tires right away.

Car is major fun otherwise. Just be reedy to do some wrenching, it's a modern BMW, so stupid stuff will break, and then break your pocket if you take to dealer.