Managed to find a 2005 550i in very good shape with 127k on clock. This guy owned it for 13 years before he left for England. Best of all for me is the keyless entry and the HUD and comfort seats.
Gearbox was replaced at 60xxx km so hopefully still a lot more km's to go!
Still in two minds as my previous 550 I've deleted the rear box. Did sound nice and was not disturbing when on the open road. Start-up and pull away was wicked!