While not exactly up to a topicstarter's specs (i.e. not currently in production), this may be the ticket:
1. iriver h140 (modded, with bigger hdd and new battery) as a transport
2. Sonosax SX-DA2 portable professional DAC\headphone amp. This is a rare beast but still can be bought somewhere for like $1500 new \ $500-800 used. This is a swiss-made, nagra-class pro gear.
3. Ultrasone Ed8
4. Belt case or e-Holster modular gadget holster for carrying it around
Another possibility would be currently manufactured Sound Devices 722 HDD recorder (supports FLAC).
