I'm tinkering with a small booklet that contains an ancient Buddhist sutta text and modern commentary, interweaved in a form of reading monologue: some sutta text, some commentary, more sutta text, and so forth.
For the sutta text I thought to use Caslon (link) but can't quite come up with a font for the modern commentary. Something light and sans-serif, perhaps, even italic?
If not Caslon and a light sans-serif, then what other pairings would make sense? Somehow I'm not drawn to using normal/bold combination of the same font though.
EDIT After I've accepted Andrew Leach's answer, I started poking around FontShop for a while. I quite like the proposal of using the same family in serif/sans, and for example Milo (link) seems to make for a legible reading type. The old sutta text set in Milo Serif Medium:
and descriptive commentary in the lighter and more modern looking Milo Light Italic:
In that case, should I use size variations of Milo Light Italic for headings? There won't be any more than chapter headings. What about table of content, and opening pages?