PERFECT ENDING
It's action-packed, yes, but at least it keeps in tone with the rest of the movie.
McClane shoots NOT the wire to the sign, but the connection WITH the sign at the truckstop, making the electrical cables fall towards Simon's chopper, which makes him panic and that stupid dumb woman drives them into a large lamppost of some sort, killing them instantly and leaving them to burn in fiery hell.
Then Zeus laughs a bit and tells McClane he should finish the call he started with Holly. Credits roll.
It's fun, concise, and is in keeping with the rest of the film.