In that short time you will do well to pick 2 destinations in CH--mine would be Luzern and the BO.

Sorry, maybe I should clarify - this is for a roughly 10 day trip.

assuming we get the Swiss Pass that gets us 4 days of train travel within the country. We are considering Zurich, Lucerne, Berner Oberland; Geneva and maybe Montreux/Lausanne>

Are you talking about a 4-conseutive-day pass or a 4-day flexipass - if the latter you also get 50% off everything that moves practically in Switzerland - including expensive often cable ways to mountain tops.

anyway I echo bobthenavigator about Lucerne and the Jungfrau region - to me the absolute highlight of Switzerland both figuratively and literally - spend a few nights in the Geneva area, hop the Golden Pass scenic train from Montreux to Interlaken - head for the hills and a dreamy base like Wengen or Grindelwald, etc.

Then take the scenic Brunig Pass train from Interlaken over the Brunig Pass to Lucerne, spend a few days there - be sure to do a boat tour of Lake Lucerne (railpasses fully valid) and then perhaps end up in Zurich or easily in Munich to fly home.

Note that if traveling after Sep 1, 2012 there is a 2 for 1 deal on Swiss Passes but only 4-day ones - like the 4-day Swiss Flexi - for travel before Sep 1 the 3-day Swiss Flexipass is almost always a better deal than the 4-day Swiss Flexipass (because of the 50% off aspect on days in between 100% covered days)

Anyways great sources to help plan a Swiss rail trip check out these IMO superb sites - www.swisstravelsystem.com; http://www.budgeteuropetravel.com/id3.html and www.ricksteves.com.

And compare Swiss Pass prices both bought in US dollars here and in Swiss francs there - same exact pass but prices can be cheaper here than there and indeed have been so much of the past several years I have been comparing. But not always so check prices on both ends - if little difference just buy at any Swiss train station upon arrival.