To help answer your original question, check this thread:
http://www.city-data.com/forum/atlan...lpharetta.html
From the research we did when deciding on what area of GA we wanted to move to, Alpharetta schools were better than Roswell.
However, I have to ask - did you read the replys to your original thread? You really, really, need to know where your husband is going to work before making a decision where you're going to live. If he works in the city, and you live in Roswell or Alpharetta, be prepared for up to 2 hour commutes (each way) in gut-wrenching traffic.
As was stated in the other thread, Sandy Springs and Dunwoody both have sizeable jewish populations and are close to Marta stations (if he works downtown).