Regarding the V200 with HE-6.
The violectric gets pretty close to being able to power the HE-6 to its fullest.
With the LCD-2, it is top notch.
Among all the amps I have, I'm not sure, but the Violectric still might be the best I've heard with it...
I haven't spent tons of time listening to the LCD-2 from the Dark Star, but I'd say that with the LCD-2, nothing grabbed my attention as being significantly better than the V200.
This is intended as high praise, when a $1000 amp can hold its own in such esteemed company as the LF and DS.
I recommend it highly if that is your headphone of choice.
Just make sure your source is up to task.
That's the only "quirk" I can report with the Vio, if you want to call it that. That it really is more source-dependant than other amps I've heard.
It seems to "come alive" when there is a really fine DAC upstream.
But, it can sound quite flat and boring with something more humble.
Cheers and happy listening!!