I'm actually considering e7e9 or the Fubar III (leaning more towards the Fubar III right now due to op-amp rolling and having upgraded some of its parts in 2010). I really want to hear some comparisons between these two DAC+Amp combos in the $200 range.
Here's a link to the Fubar: http://www.audiophileproducts.com/usbstereo
FWIW Gorgatron, the guy at audiophileproducts told me the following the other day via email:
The Fubar III has two Opamps. One LM4562 (soldered) onto the DAC board and one OPA2604 (replaceable) on the headphone amp board.
[...]
I also listen to the Fubar III with my tried and true Sennheiser HD600’s, sounds wonderful. Also, I use the OPA2627 SuperChip in the headphone amp section.
The LM4562 is sort of the canonical "neutral" op-amp (I used to use one in a cMoy when I wanted to have an analytical listening session), so I'm comfortable knowing that's what the DAC is using. As for the headphone amp, I love having the choice. The OPA2627 super chip is basically 2 OPA627s on one chip. I'm quite partial to the DY2000, which I've used in my 595s for 2 years -- it really brings out the best in these.