Nankai,
Have you ever heard of the Rockbox project? Allowing the Rockbox developers full specifications and supporting this project will give you a giant (Well, nothing's giant in this niche of DAPs) support group. Rockbox developers have wanted to get in touch with a company for some time, and this is a project that's almost inherently suited for Rockbox use.
Please consider it.
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Desktop: Home-built PC with ESI Juli@ -> Meier Audio Arietta -> Audio-Technica W5000 (Or rarely Beyerdynamic DT880)
On the go: Microsoft Zune 80 / apple iPhone 3GS (32GB) -> (iBasso T4 or Fiio E5) -> Ultimate Ears UE-11
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