SW1X DACs have gotten good feedback here and they offer a trial period, which is really nice. Uses a tube and reported to have excellent tone and soundstage, but maybe not the last word on upper-octave detail if that's important.
In solid state the Metrum Onyx is worth a look. Probably trades some tonal bloom for added detail up top compared to SW1X. I think HiFi Heaven may offer a trial period that you could take advantage of.
Both of these are R2R non-oversampling (NOS) DACs, which some find more "natural" sounding while others consider them to be less accurate than the more common delta sigma/OS DACs. As always, it comes down to what sounds best to you in your system, which is why I think a trial period is critical. Best of luck.