May I suggest the Melokin DA9.1 DAC+head amp?
http://www.qlshifi.com/en/wzcapi/da9.1.htm
It uses the ES9038PRO DAC, instead of the stripped-down Q2M version used in the Topping products (DX7s, D50). It would be nice to see whether the full 9038 chip (which cost signficantly more and uses much more power than the more common Q2M) adds any significant difference.
The DAC itself is also interesting, since it allows adjusting the chip parameters (dither, jitter reduction), has I2S support, provides adjustable impedance for the head amp (starting from 0 ohms, on the contrary to DX7s' high impedance) and outputs more power than the Pro-Ject S2 (through the OPA1622 buffer). The opamp and clocks are also user-replaceable.