Hifiman EF400 ís the second all-in-one in Hifiman's history. It's fully balanced, built around an R2R DAC and a headphone amplifier that is told to be capable of running the Susvara. The price is set at $599.
The Aurora is the newest DAC/Amp combo by a Chinese manufacturer Yulong. It's designed around the latest ESS ES9068AS chip, also offering a Class-A headphone amplifier. It's priced at $520.
XI Audio Broadway S is a really interesting transportable headphone amplifier that is battery powered and it runs a pure analog discrete class A. It is priced at $1599.
LittleDot MK III SE is a fully balanced hybrid headphone amplifier by this legendary Chinese manufacturer. It pushes up to 2.5W per channel and it's priced at $499.