Which Swiss Pass is best for us ?

My wife and myself are planning our trip to Switzerland in August. Itinary details as follows :

6/8/12 Geneva - Interlaken - Grindelwald - Jaunfraujoch - Grindelwald - Interlaken - Zermatt ( overnight stay at Zermatt )
7/8/12 Zermatt - Visp or Brig - Glacier Express to St Moritz ( overnight stay at St Moritz )
8/8/12 St Moritz - Tirano by Bernina Express - Luggano - Locarno ( overnight stay at Locarno )
9/8/12 Locarno - Domodossola - Brig - Martigny - Montreux - Geneva
10/8/12 - Geneva - Chamonix - Geneva

Which pass is best for us if we intend to leave switzerland on 13th and come back around 27th and keep our travel options to other places in Switzerland until the 31st ?

Hello Servansing, and welcome to MySwissAlps. You'll be traveling a lot, so you'll need a pass that provides free traveling throughout the country on all days of your itinerary: that's what the Swiss Saver Pass and the Swiss Saver Flexi Pass offer. They also allow you to go wherever you want whenever you want, without having to buy tickets for your rail, bus and boat trips.

Do you intend to travel in Switzerland on August 11, 12 and 13 as well? If so, an 8 day Swiss Saver Pass would be the perfect solution for this portion of your trip. If you don't plan traveling on these days, a 5 day Swiss Saver Flexi Pass would be best for August 6 to 10. A 4 day Swiss Saver Pass would be best for August 27 to 31.

Just a note on your itinerary: you've planned some very long trips. Your schedule for day 1, for example, is too much in my opinion. Did you check the timetable (mind the right spelling when entering departures/destinations, e.g. Jungfraujoch) to find out about traveling times? If you don't mind spending long days in the train that's fine of coure, but you may want to enjoy the outdoors too.

Arno

Thanks for your reply. We will take into account your recommendations while doing our final itenerary.