I've owned the D60 and Stereovox as well. They're both definitely very smooth, neutral cables.
For my taste, I chose the Acoustic Zen MC² because it had slightly more organic presentation. Whether this is something you'd want to add to your existing set up is for you to decide. Where I thought the MC² "outperformed" both the D60 and Stereovox was in soundstage size and sense of scale. The other two sounded quite small in comparison, where the MC² created an immense soundstage.
Another cable I own and like is the Virtual Dynamics Nite. In terms of scale it is similar to the Acoustic Zen, but it has a more neutral and somewhat drier presentation. I swap them depending on my system configuration, but for the past two years I've only been using the MC².
Here's the irony. Neither the Acoustic Zen MC² or Virtual Dynamics Nite are ture 75ohm digital cables. I believe the MC² is 110ohms and the Nite is an analog cable. Go figure.
I've heard a lot of good things about the Pure Note as well.