Need an addon for non-focused castbars

[Lyelu]

Hi,
I'm a healer, and looking for an addon that shows me castbars for particular mobs. For example, in Lich King, all of my targets are players. I select Lich King as focus, and I can see his cast bar using my Quartz.

Now I want a castbar for the Shambling Horror, so I can cast Soothe when it casts Enrage. Is there a mod that will let me show castbars for the mobs I choose, without having to target or focus them?

Thanks.