Thanks for the reply. I really want the a900x but the super long non-removable cable is a deal breaker. That's one of the reasons I'm replacing my hd598's but at least THAT cable is replaceable with a shorter one. I know it sounds petty, but it's because I plan to use these out and about sometimes (even though they are huge, IDC about that).
On another note, I wonder how hard/expensive it would be to have the a900x recabled with a shorter cable? That could be an option. I haven't heard them yet, but I did listen to some W1000x, which I really liked. They should be fairly similar sounding.