I’d like to know the most common chords in a given key. All-encompassing chord charts are great for general reference, but I’d like to build smaller ‘key-specific’ chord charts, maybe grouped by ‘common’, ‘infrequent’, ‘rare’, and ‘jazz’ chords. Gentle jab at jazz players there. 
The trends navigator is awesome for figuring out what ORDER the chords might come in, but I can’t seem to find a somewhat complete chord list for each key, sorted by usefulness.
There are plenty of basic lists like this: http://www.guitar-chords.org.uk/chords-key-c.html. The primary and 7th chords are useful, sure, but where do the ‘add9’, ‘sus4’, etc. chords fit in? and does anyone ever really use the ‘m7b5’??
Anyway, just looking for a simple chord list, with most common/useful chords at the top, fancier/less common ones toward the bottom.