Hi Sreraku -
I'd suggest a circular itinerary, with the high Alps first, due to seasonal weather. By mid- to late-October you have a chance of running into difficult weather near the Jungfrau, so you should get there first.
That is the reverse of the usual advice to start in Luzern, and may involve some backtracking or duplicate routes, but it is the way I would do it. I'd try to keep the lower altitude locations at the end, because Winter comes later at lower altitudes.
I'd suggest that you go immediately to the Jungfrau region upon arrival. You could stay in Lauterbrunnen, Wengen, Mürren, or Grindelwald, but Interlaken is a poor choice unless you plan to use it as a rail hub for other parts of Switzerland. More commercial, less scenic than the others.
For scenery, Wengen and Mürren are best.
I prefer Wengen:
Wengen gives you particularly easy access to Männlichen, and this easy trail is spectacular. For photography, it is best to walk it from Männlichen toward Kleine Scheidegg.
Then. go to Montreux .
After Montreux, go to Luzern.
Finally,back to Zürich.
On the legs between the Jungfrau region, Montreux and Luzern, you can go by the slower, more scenic Golden Pass route for one of the trips, and return by the faster route through Bern on the other. Or vice versa. Or, do both on all or parts of the the Golden Pass route, if you like:
Use the map and timetable that I linked in my earlier post to organize. In the map, zoom in to zoom level 32 to make the train lines visible clearly.