It seems like china cabinets are being used less and less these days in modern dining rooms. Could it be a lack of space or less formal entertaining? Either way, I think the china cabinet is still a classic. Their size lends them to making a big statement in the room (which is why I loved the detailing on the doors of the one above).
And, if you think china cabinets are only for traditional dining rooms, here are some great examples of how they can blend with more modern decor: