At the end I did buy the Henry Dac, connected directly to my AKG Q701, and wasn't that impressed, because as Børge clearly stated, you really need an amp!
So, I went ahead and bought the Matrix M-Stage amp. and WOW, I could immidiately notice a huge difference("night and day") in all aspects. even older recordings became alot more enjoyable, not to mention, the ones that already sounded great...
But, as the M-stage features an Input selector, I connected both the Henry dac, and the Hifimediy simultaneously, for some A-B testing. just out of curiosity.
I fired up two instances of foobar, one for each dac and scheduled playback of some hi-rez files to the same time, for seamless switching.
To my amazement when I was switching between the two dacs, I noticed no differnce at all. Tried to focus on some specific part of the sound, and still nothing.
After playing for some time, I forgot on which dac it was set, and definitely couldn't pick it up by the sound signature alone.
My Conclusion: The huge leap in sound quality was due to this amazing M-stage amp. Though I really wanted the Henry to sound better(costs much more, and was compared to dacs whose cost is even higher), the difference in SQ just isn't noticible, at least with my setup, and to my ears.
Maybe higher-end headphones would make the difference.
Still, I'm not saying the Henry dac isn't great, cause it does sound amazing with this amp. plus, it supports up-to 192/24 from usb.
But, what I am saying is that the Hifimediy is SUPER value, and It even has volume control (which is handy, until you buy a decent amp ).