When we planned our Switzerland trip we used the forum, myswissalps.com. Very similar to this and so very helpful. Full of trip reports too.

It was our first time and we did Murren, Jungfrau etc. So I can't offer up personal experience but that site is wonderful and has many experts on it. If you give them what you want to experience, they will point you in a direction.

Happy planning. Love Switzerland!
Ellen