Some late breaking news from Heed that I think applies to this thread as well, is their introduction of a new headphone amplifier called the Canalot which also uses the Q-PSU external power supply and like the Obelisk Si, has the ability to be fitted with the optional Dactilus DAC card v 1.2!
I've posed a bit about it in the CanAmp group thread here:
http://www.head-fi.org/t/192190/heed-canamp/2745#post_8407510
Have a great day everyone!
Dan