If you want something that is almost portable and decent sound check out the following DAC with headphone amp. (limited to digital only)
Matrix Mini-i Pro 3 Wireless Bluetooth DAC/Amp – Apos Audio
You can keep this next to your seating position and use the WiFI for streaming (it has BT, Ethernet, etc,,). WiFi is not the most reliable streaming option but when it works it is good. I had this unit and gave it to my friend since it was so easy to use, and my friend does not need the hassle of complicated setups.
Now if you want to step up to the very best quality sound you should explore RAAL-Requisite’s headphones. You can even use your 2-channel amp to drive them (not your preamp).