Brett, i like the sword above that you present but i don't love it. I can really appreciate the skill and control that went into producing it, like you say.
To me its a little too much.
I'm a sucker for Yokoyama choji, when its done really well, but.
At the end of the day, what i have found to be the most beautiful hamon on a sword, is Hizen Tadakuni gunome midare. I no longer have any good images and to be honest, images will never do it justice. Aoi art sometimes describes his hamon as "Cumulus clouds" or "Summer clouds", in hand you would see why. The hamon is perfect against neat well polished Hizen Konuka hada, its a beautiful combination.
Not overpowering or overly flashy, just subtle perfection, a bit magical when you catch it under the right light, like mist.