Any particular E39 years to avoid?

[Adnan]

Hi,

Considering an E39 wagon for my wife; are any years in particular to be avoided? There's that old concern about first model year BMWs.

How's the 2.8 engine compared with the earlier and later 2.5? A '95 (E34) wagon may be an option, perhaps a better option?

Thanks,
Adnan