To be honest either the K&M 16085 or 16090 are the best. They work vertical or horizontal which is a big benefit. Not sure if you can do do that with ATH-HPH300.
The HH 10 feels cheap.
Trust the germans!
I received the Chinese ones in the mail today. From what I can see, it's the exact same model as the Sennheiser. The only difference is that instead of the Sennheiser logo on the soft pleather and plastic round part, there is a Chinese character logo.
i had the AT HDP300 once, the thickness of my table was (slightly?) too thick, the jaws couldnt open wide enough, and the jaws-length doesnt go into the table deep enough, the screws were plastic and the clampforce wasnt sufficient.. so buy only if u have a thin table top..whatever "thin" is :P
If you check the prices on amazon the Audio technica one is the cheapest (Might be different once/if a drop happens but that's at least something to go by!