Looking for an Amp and Upgrade DAC that has Similar Sound as SMSL SU-8s Dac

After watching this review about the SMSL SU-8S DAC, I knew that this is the exact sound signature I have been looking for. What is an upgrade to this, that has the same sound signature, but does it better?

Also what’s a good amp pairing with the SU-8S? And has the same tuning?