What to do about the Sound of Sirius

I'm using a Kenwood DT7000S home Sirius receiver in an otherwise very hi fi system. I realize other providers might arguably have better sound quality, but Sirius has the content I want. There are actually 19 hours or so when I'm not listening to Howard Stern and I really want to get better audio quality out of the music channels. The Kenwood has an optical output, but I don't know if getting a moderately priced DAC will make enough of a difference to make me happy. I'm not expecting SACD or LP quality, but it would be nice to get at least in the audiophile ballpark with Sirius. There are several home receivers on the market, but I suspect they all suck. Does anyone have a reasonable solution?