http://www.jdslabs.com/item.php?fetchitem=39
ODAC (USB, so it's for PCs/laptops). It acts as an external soundcard.
http://www.audio-gd.com/Pro/Headphoneamp/C-2new/C2.2EN.htm
C-2.2. The amp.
So depending on where he listens to music (needs USB input for the ODAC), you hook up the ODAC to your source, then a cable from the ODAC to the C-2.2.
That should be quite a good combo for all needs.
Of course he can save money by getting an amp/dac all in one, like the NFB-5.2
http://www.audio-gd.com/Pro/Headphoneamp/NFB5/NFB5EN.htm
I have the NFB5, and I absolutely love it. It has a lot of power. 1.8 watts at 50ohm (the LCD-2 is 50 ohm).
With the NFB-5.2, it has a USB input, optical input, and coaxial input, so you're covered for the digital inputs. Just hook it up, and you're good to go.