Jonathon, this is a good idea for a post. Let's cover the metrics you've listed here quickly first, then other things not mentioned.
- Page Rank - ignore and don't present. It's not exactly easy to move the needle on this month to month.
- Moz Rank - better than page rank, and present as a baseline and compare to competitors.
- Inbound Links, not just number, but number of unique domains.
- Keyword Ranks, aggregate by #1, top 5, top 10, top 20.
- Alexa, in the same chart/area as Moz Rank.
- Pages indexed, yes, only if they're running flash, or have no content to speak of. And educate why redoing website or serious content dev is priority numero Uno for their SEO.
I also think it's important to present them with data that acts as a "carrot" The above stats can show them how they rank against their competitors, but the connection in terms of what they'll gain by out ranking them on those stats isn't clear. I also like to collect data from Spyfu, Keyword Spy or Compete on their comeptitors traffic. If the data is there, you can chart their **traffic share. **This shows them how much traffic & clicks they're missing out on by not ranking high enough.I think this number speaks volumes.