The only reason I think it's the hub nut is that the wishbones (and bushes) aren't that old, so neither is the ball joint. The wheel bearing makes no noise (i.e. no rumble), and the CV joint doesn't click.
However, I've got this odd noise associated with the suspension that comes and goes, and I noticed that when I had the wheel off I had some play in the brake disc... so I put the wheel nuts back on, and I think the play is in the hub. I've already had the hub nut tightened once before, so I think it has worked loose again; maybe the locking crown thing isn't doing a good job.