Need help Choosing a DAC/Amp Combo

[spydur]

Hey Guys,
I need it primarily for Music and movies. I listen to Rock, hard rock, D & B, Dub Step, Trance, a little hip hop. (AAC128 streams, 320, flac)
I will be using the Asus xonar DX as a source (Dolby Headphone) for movies.
 
I am  getting the Sennheiser 650
I wanted to know which DAC/Amp might be better suited to my needs. I am willing to spend upwards of $450 for the combo.
I have currently narrowed it down to the following 4 (I am open to suggestions):
 
FUN (Rev A, possible earth OPA)
Matrix Cube
NFB-11
Sparrow (Rev A)

 

[spydur]

anyone?

 

[spydur]

hello? Is this mic on?

 

[GnuB]

I am sure the old-timers are getting a bit jaded about answering the "what is the best amp" for the HD650 question.
 
 I don't have a HD650 so I am ultimately unqualified to answer, but I would suggest doing an advanced search on "HD650 headphone amp" in the "Headphone Amp (full size)" with in the last three months and you will get a months worth of reading.  I got a decent response from a similar thread earlier when trying to decide between a few different amps, but in the long run, it was homework on existing threads that gave me the answers I was needing.  
 
The amp I chose was not on my first short list.  I found out about it through searches.  There is a lot of information and mis-information to sort through, but for me, some of it was the thrill of the hunt.
 
Happy Hunting!