dac for multiple sources

what should a person consider if they want to enjoy quality sound from an external dac and their sources are a cable box, dvd player, cdp, computer files via usb, and a sonos system? i've had a wavelength brick which is usb only and a proceed cdp which, prior to dying, handled a few but not the cable box. my budget is +/- $3k if bought used thru a'gon. my listening preference is more warm (tubes) than hard (ss).