Which would you pick between the two DAC.

Thank you, Dave.  Music will be from PC.  Sonus faber Venere 2.5 speaker, Cary Audio SLI-80 Integrated amp, and Schitt Modi2 Uber DAC.  Mostly listen to vocals.  Don't know strengths and weaknesses.  
One other question, would it be a huge improvement in sound quality from Modi2 to Wadia 321 or Codex?

Thank you everyone for your advise.

Dave, I really like air and openness, details, and warmth.

George, my Modi Multibit look and feel just like a toy to me if compare it to other brand like Wadia or Ayre. The front button switch got to much play. It might be because it is only $249. This is one of my main reason that is why I am not sure if I really want other Schiit. I had an eye on Gungnir multibit before purchase Modi too.

Dave,

Thank you.  I will take a look at it.  I almost get ISO Regen while back when I first got Modi Multibit and had noise problem with USB signal with iMac.  What I did was I disconnected usb 5V from iMac and run 5V from the wall and no more noise.   

Thank you everyone for your input.  

Thank you.

Again, Thank you so much everyone for your value info.  

david_ten, Okay, if $2,500 will make a huge sound improvement from $1,800 (Ayre Codex) or $1,200(Wadia 132) then I am willing to do it.  But I am not sure because of my system is not good enough to be able to hear huge difference in $2,500 DAC.

Thank you, David and Dave.  

@ david_ten,

Thank you. I am not planning to upgrade my other components anytime soon.

"The 1.5K in left-over budget, in my opinion, would be better applied to a networked approach (which eliminates your PC as the direct source), better cabling, and a product to clean up the signal into the DAC (input dependent). Let’s call this the best bang for your current buck /system approach. This will provide you with really good results, and is beneficial in that is broadens your approach to and understanding of computer based audio."

Sure I can get rid of PC of of my system. Please list the components you suggest that I need to buy.  My only sources of music will be CD and Spotify/Tidal.

Thank you,
Eddy

Thank you, David and Dave.