Best of the "Best of Chicago" Compilations

I have "Group Portrait", which is pretty comprehensive. Recording quality varies with Chicago track to track across so many albums, from mostly good to very good.

Surprising about the Rhino collection. Rhino stuff is usually pretty good though there is only so much that can be done with some recordings.

In my opinion you would have to get columbia records cd's of each album, I, II, III, V, VI, VII and I suppose you could burn your own cd copy of selected cuts you like best?
Also there is the original columbia "Chicago Greatest Hits" from the end of that same period, I think up to Chicago VIII. just an idea.

The first two albums or CD's...CTA and Chicago contain many of their best songs, and the Rhino re-issues on CD sound great.