Swiss here as well with kids... and the appartments (currently renting for 2400/per month) we look for at the moment are 1.2 Mio CHF which is nearly equal in USD and thats for 4,5 room 110sqm. Would be interested if you did a good trade by moving to Berlin as I see loads of tech jobs overthere but afraid I would just make my situation worse to be even less able to afford something in Switzerland in the longterm. Do you have more or less money after all deductions and rents etc?