I have been hesitating to get into this discussion, but maybe this will be helpful.
As some of you may already be aware, I introduced an amp to other head-fiers, and people have had VERY good success with it. It's the TBI Millenia, which is an integrated power amp. When combined with a resistor box, which the engineer who designed the amp is willing to put together for your particular headphones, the sound is impeccable. The person who owns the company and is also the designer is the most helpful person I have ever come across in my 35 years or so involvement with home audio. His name is Jan Plummer. I am going to include some links about the amp that you can check out if you like. He offers a 30 day home trial period. The amp costs $500 and the resistor box he will put together for you is $100. If you wanted to create your own resistor box, he could suggest to you what resistor values to experiment with to match the needs of your headphones. The idea is to lower the gain level of the amp so that it is a pure, black background. If you want to disregard this amp as an option for whatever reason - that's fine. But with all this talk about spending thousands on headphone amps, it would seem like saving some money and having the opportunity to try this amp out at home would be an attractive option.
You can read Gary in MD's review of the Millenia if you scroll down a bit. He uses Audeze LCD3s:
There's much more on the web about the Millenia, including a new thread on audiocircle that deals with the latest iteration of the amp, as well as how some head-fiers are now using it.
By the way, don't hesitate to call or email Jan Plummer with any questions. He is really into this stuff. (He picks up the phone when you call TBI).
On your recommendation, I talked to Jan. He said it would take about a week to build a resistor box and ship it with the amp. I'm really tempted. It'll take about 4 weeks to get the WA7 I ordered, so this might be a better solution. I'd really like to hear some impressions, but I doubt anyone's tried this combo yet.
And, in any case, I'll still need a DAC.