I've got a fat head. Not freakishly fat or deformed, just a big head. Like US hat size 7 5/8 - 7 3/4. Most of the headphones I own have been expensive mistakes because the cans sit so tight that I can barely keep them on long enough to even break them in. One pair of Grados seem to be the exception. Big flappy ears don't help much either. I'd love to dive into a pair of open backs but, well, expensive mistakes.
Any other fatheads out there with a recommendation?