[cdbob]

I'm looking to run a nice small set-up for my DT800 600 ohms and these are the best two options I can find for my price range. 
 
For anyone that doesn't know the CDAC is a version of ODAC that ships from Canada, so it's cheaper for me to buy.
 
The advantages of the O2 CDAC over the M&M stack is that it supports Android while apparently the M&M stack doesn't. However the M&M stack is cheaper and looks MUCH better.
 
Does anyone know about android on the M&M stack?

 

[linglingjr]

Both combos are very highly regarded.  What kind of sound are you looking for? From what I've heard the Schiit stack lacks bass and is much less playful than the O2 and ODAC.  At least that's what I've heard, it really depends on your tastes imo
 
o2 and ODAC might be better if you listen to a wide variety of music and stuff that isn't mastered as well will probably sound a bit more harsh on the schiit stack.