N4 beats the GN hands down, so I don't know why anyone's complaining. The Nexus One and 4 were the pinnacle of design and build quality when they released, while the NS and GN were plasticky shite. Two strikes for Samsung, let's not give them a third.
On the other hand, I'd rather have a Sony Nexus just to see how they'd approach it (and because the camera would be fantastic.) Or HTC again, it's been far too long. Hell Moto could make a decent Nexus if they focused on their strengths (battery, industrial materials) with some Google influence (handset design, software.)