If you are used to minor repairs the the mod should be no problem. It involves simply adding some blocking material to the port (I use blutac) and altering the spring inside the headphones to make it sit flatter to the headphone body and to make it a bit wider.
Warm and extended, noting springs to mind but some of the old Parasound dac's would be a so0lid choice and I quite like the Adcom GDA-700 once I had replaced the aging caps.