Can I also recommend a trip to Gruyeres from Montreux,just a change of trains at Montbovon.
It's a beautiful little town,just uphill from the station and you can load up with cheese from the dairy near the station on your way back.
John,your itineries are making me want to bring my next years Swiss fix forward to the winter.Flybe are flying to Geneva direct from the IOM from Jan - April so am tempted to have a week in Geneva/Lausanne/Montreux.It saves all the hassle of Terminal/Flight changes in the UK.
What do you reckon?