You don't mention what you're looking to improve upon or your price range, but some DACs worth looking into:
Calyx Femto
Empirical Audio Overdrive
Bel Canto DAC3.5VB
Berkeley Alpha 2
The only one I've had in my system is the Bel Canto and it is fantastic. Woulda bought it if I had the funds. Very transparent with nice 3D soundstage, very natural tonality, and no edginess or digititis. My guess is the Berkeley is just a touch warmer, but that's just going on what I've read from reviews so take it fwiw.
Best of luck, and please let us know what you find.
Calyx Femto
Empirical Audio Overdrive
Bel Canto DAC3.5VB
Berkeley Alpha 2
The only one I've had in my system is the Bel Canto and it is fantastic. Woulda bought it if I had the funds. Very transparent with nice 3D soundstage, very natural tonality, and no edginess or digititis. My guess is the Berkeley is just a touch warmer, but that's just going on what I've read from reviews so take it fwiw.
Best of luck, and please let us know what you find.