would not rely on zillow predictions. it is great for data mining of recent home sales to get a good sense of current values, but don’t use it for prediction of future gains.
and where in North SD would you and the family be ok with? Fallbrook? 4S? Escondido? Encinitas? North County is extremely diverse and spread out. If you are regretting Temecula, there’s going to be large parts of North County you’ll regret as well.