Help in choosing the best Pass - Swiss and Paris

Hi,
Me and my wife will be traveling to Rome, Florence, Venice, Swiss, and Paris in July.
We will arrive from Venice to Zurich by Bernina Express (Tirano-Chur).
Planning to spend whole 10 days in Swiss before going to Paris.

Following is the tentative itinerary:
- Zurich (2 days) - sight seeing Zurich and Heidiland
- Lucerne (2 days) - sight seeing Lucerne and Mt.Titlus
- Interlaken (3 days) - sight seeing Interlaken, Jungfrau, Schilthorn, Murren, wengen, Gimmelwald, etc.
- Zermatt (2 days) - Matterhorn, Cornegrat
- Montreux (1 day) - Chateau de Chillon

Leaving to Paris from Montreux and planning to spend 3 days in Paris.

Questions 1:
I'm confused on which pass would provide most savings?

Question 2:
Should I go with Swiss saver pass (or) Half fare card (or) Flexi pass?

Question 3:
Is it a good idea to buy Eurail France-Switzerland Pass? How is the coverage compared to the Swiss Saver/Half Fare/Flexi
pass?
Looks like only 1st class is available with the Eurail France-Switzerland Pass.

Question 4:
Would you suggest additional places that I have missed in the above itinerary? Any short excursion around?

Question 5:
Does the above itinerary doable? Would it be too hectic?


Thanks!