Parts Availability

Sooner or later, your cans are going to break. Old discontinued headphone (parts) are often unavailable. Some companies stock everything. Other companies carry nothing. Head bands, cables, ear pads. They all wear out. If your cans are out of production, you might be at the mercy of the after market. If your drivers fail - it might mean new cans.
We need to know which company stands behind their products and customers, and which don't. I know Denon does not.
I know Fostex does. What other companies make the list?