DAC Choices - $5,000 to $7,000

@thaluza - It sounds like we are getting pretty much the same thing and the same deal.  I did not want to add a bunch more upgrade options since there are several of the former 2020 model upgrades that come stock with the 2021 model, but I am adding the Class A output stage upgrade.  I believe I would like the look of the new chassis as Benjamin described it to me but, given the option, I appreciate that I can get the price break by using the 2020 chassis.  The ferrous chassis will provide better shielding from EMI fields that can result from other components which are located in close proximity or stacked on top but if that is not an issue then the aluminum chassis should work just as well and may provide a better resonance characteristic.
@jimmy2615  - My balanced V3 has Hammond chokes and no upgrades that I am aware of.  However, it sounds wonderful and so it was a hard decision to upgrade from that.  It will be a great deal for somebody who wants most of the EVO sound at half the price.  I am hoping the EVO B4B21 offers sonic improvements in the range of 10 to 20 percent over the V3 and then I will also have the benefits of better boards and modularity to allow for easier future upgrades, such as the cap upgrades.  The S/PDIF input is also supposed to be a significant improvement as is the grounding scheme and a few other features.

Thanks Mitch.  It will be interesting to see what you think of the upgraded chokes and SPDIF upgrades.  I have a B4B on order also.  Like you I wanted to try before committing to the expense of the Evo; in my case I tried a V2 to see if I could glean what the general character or house sound, if you will, was of the Mojo DACs.  Even with the simpler product I really enjoyed the overall presentation.  Musical flow, tone, overall balance were very much to my liking.  

I have worked things out with Benjamin and have taken the plunge on a new Mojo Mystique EVO B4B 21 (in the 2020 chassis). The wait would be more difficult except that he is letting me keep my Mv3 trade-in unit until after I receive the new EVO DAC, which I appreciate. I understand the EVO is likely to be an evolutionary (rather than revolutionary) improvement over the Mv3, because the basic design has not changed. However, I have heard what is possible from evolutionary improvements through my SMc Audio gear so I will be excited to hear the EVO when it gets here.
There hasn’t been any activity on the previously linked EVO thread since September so not sure if that means nobody here has received a new EVO unit since then or if they are all too happy enjoying their new EVOs to post. The only professional review I have found so far is the one on Audiophilia although The Sound Advocate was supposed to have reviewed an EVO in December.

@mitch2 Congrats!  Really looking forward to reading your impressions.  Obviously you greatly enjoyed the MV3 given that you upgraded.  Interested to read about how much of a change the new unit is.  Glad you'll have the old one on hand so you can do a little A/Bing.

Been playing with USB cables here.  
After using I2S for so long, I forgot how much USB "stuff" I had accumulated that I could try.  Cables by Totaldac, Curious, and Wireworld, plus the dual run Gemini cable by ifi.  I also have the W4S Recovery, ifi USB filter, and the ifi iPower that can be used to separate the power leg of a USB cable, particularly the Gemini.  My Antipodes DX G3 server has both powered and unpowered USB ports so I can use the Gemini cable without the iPower by connecting the power leg to the powered USB port and the signal leg attached to the unpowered port, so the signal does not travel in proximity of the power, or I can use the iPower but that requires another short USB cable between the powered port of the DX to the iPower (I have very short USB cables by both Curious and Wireworld for that purpose).

No clear winner yet.... 
Curious (yellow) - Really nice body, good tone, smooth, a little "thick" sometimes
Wireworld Starlight 7 - Smooth but maybe a little thin sounding
ifi Gemini - Good but not great across the board, a little recessed, competent
Totaldac d1 - Clear, good tone, near-neutral on the thick/thin scale, quite musical

I am starting to remember why I didn't like USB...none are perfect (at least yet) and while differences are mostly subtle, I do hear differences.  So far, I think the best two are either Totaldac d1 (probably first place) and Curious with or without the Recovery and with or without the ifi USB filter.  I think the benefit of the Recovery may be a little greater with the Curious but the benefit of using the Recovery and/or the ifi USB filter are subtle at best, and maybe a wash, so I need to listen more to be certain.

Interesting that Benjamin has discussed with me how much better S/PDIF can sound through a good Ethernet to XLR, AES/EBU, or S/PDIF converter, which is why he has included the S/PDIF signal path upgrades on all future EVOs, including the one I am getting.  I know on my Metrum Adagio, the I2S input from the Ambre converter sounded best, but was very closely followed by AES/EBU from the same converter, which was a little bolder with great bass.   I will be very interested in hearing AES/EBU out of the Ambre and into the EVO.