A few points you may want to consider.
First, the Resonance is iconic Journe, and it is the watch which caught the attention of most of us who have become fanatical Journe collectors. With the new interpretation of the Resonance upcoming, I am of the opinion that the earlier Resonance will become more sought after. You are right about the lovely symmetry of the Resonance, and I’ve never tired of wearing mine.
Second, the Calendrier is a wonderful retrograde watch, and as much as I admire the Octa movement, it lacks the fascination of the Resonance movement. Winding can become an issue, and some have found the Resonance somewhat difficult—I don’t share that view, and the experience of a daily wind when I am wearing the watch is part of the romance of the Resonance. Caution: I would not place the Calendrier in a watch winder, and Montres Journe has warned of the same; it is easy to damage the movement even with the best winders. The calendar functions are easy to use, though I admit to keeping mine wound each day for five + years with no issues.
For me, the Resonance has a unique design, wholly integrated, and beautiful in both design and execution. The Calendrier while functional and with a wonderful historic design is a second Journe and not a first—though I know for others that is not the case.
A nice decision you have, and enjoy the journey.
Best,
Douglas