Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
I really think Portland would be the best choice. It has great public transportation and a lot of family friendly urban-neighborhoods. San Francisco and Seattle could also work, but you said that you already have live there.