I'm a speaker guy, but glad to see this development for those without decent rooms (where the headphone option make tons of sense) or those who have learned the innate advantages of active (even powered) speakers and don't need power amplification. Just some of options out there for DAC/pre-amp/headphone amps:
ADL Esprit ($870, no DSD, RCA analog input, very compact, good sound)
Ami DS5 ($750, very compact, great sound, but crummy volume control)
Asus Xonar One Muse Edition ($900, no DSD, fully balanced design, great sound)
Audio-GD NFB 28 ($800 with TCXO option, DXD, includes BNC digital input, XLR analog inputs and headphone/line outputs, great sound, remote)
Benchmark (various models $1000-2000, with/without analog inputs, compact, truly the benchmark for this type of gear)
BMC Pure DAC ($1800, includes AES/EBU input, XLR analog input/outputs, well built/good value, great organic sound, remote)
Grand Fidelity TubeDac 11 ($390, includes 2 RCA analog inputs, 3 RCA outputs)
Mytek 192 ($1700, firewire input, compact, great sound)
Oppo HA-1 ($1200, 32/284, 256DSD, AES/EBU digital input, RCA/XLR analog inputs, XLR headphone/line outputs, spectacular sound, remote, NEW)
Peachtree NovaPre ($800, no DSD, RCA analog input, 2 RCS line outputs, good sound, remote)