I am surprised that the D50s doesn't receive more criticism. The THD+N graph certainly appears to have some goofy stuff going on in the high frequencies, even before the issue at 28k that amir mentions messes with the results. That graph makes me uncomfortable recommending it.
The SMSL SU-8 v2 is okay I guess but still exhibits the ESS hump.
Personally in this price bracket, I still think the JDS EL Dac doesn't get enough love around here. Maybe not world class SINAD certainly does almost everything very well. Only reasons not to get it are if you need a screen, XLR or remote. It bests those mentions here in reliability & service.
As always, make sure what you buy does well enough in testing as to be audibly transparent, otherwise, it's all about what features and aesthetic you want.