Those sound like great ways to visualize the QoS limits and "headroom"

So what I imagine is a single graph for an object that shows the limit and current usage (likely stacked to easily see the delta) and a different graph showing the remaining values (declining or bottom feeders would be bad) - all filtered by the object selected above them.

Now if we can just get the OnCommand tools (OCPM and/or OCI) to be able to alert on thresholds using these same values, we'd be in business.  Than you for the help visualizing the data for troubleshooting!