Which Pass to buy?

I'll be travelling to Switzerland for 15 days from 1 Jun. I've done a swiss card comparison (swiss saver pass, swiss flexi saver pass, half fare card etc) an found that the half fare card seems to be the cheapest option for me. Have I missed out anything? I'm travelling with my wife and 13 years old daughter (which I believe it's free for her w the STS Family Card). My itinerary (only the train travel trip) is as follows:

Day 1 - Geneva Airport to Montreux (CHF 55 per first class ticket per adult)
Day 2 - Chocolate Train
Day 3 - Montreux to Zermatt (CHF 114 ... )
Day 6 - Zermatt to Locarno via Simplon Pass and Centovalli Train (CHF 166 .... )
Day 8 - Locarno - Lugano (CHF 29 .... )
Day 10 - Lugano to St. Moritz via Bernina Express (CHF 75 .... )
Day 12 - St. Moritz to Bern (CHF 165 .... )
Day 14 - Bern to Geneva (CHF 78 .... )

Thanks

Thanks for your prompt reply. I'm thinking of sending in one of my luggage from Geneva Airport train station on Day 1 and collect from Zermatt station on Day 3. Is this possible?