Teac has a digital docking station that has received some good reviews (never heard one myself). Looks like it is the DS-H01. Built in DAC. May be good for what you are looking for.
I also believe that Wadia builds something close to this.
What do you plan on using for your headphones/amp?
I also believe that Wadia builds something close to this.
What do you plan on using for your headphones/amp?