How do you know?

How do you know where your supposed to 'settle' down? John and I were having this discussion at dinner tonight. How do you know where the perfect place is to buy your 'forever' home, raise a family, and live out your years? John and I have been sort of 'nomads' around this Mid Atlantic region for the past 7 years and we have enjoyed everywhere we have lived, but we just don't know where the 'it' place is? We look at the obvious factors: school system, taxes, job opportunities, parks, shopping, etc., but how do you weigh one thing more than the other? And how do you know you will both be happy there? It seems every place we have lived one of us has enjoyed it more than the other, making it difficult to please everyone. Plus, we have always moved where we know people for the most part, and how do you know this place you 'settle' in that you will meet people you can be friends with? When you are almost 30 years old like we both are, you get to thinking, should we only focus our move on our future children or on ourselves too so we can enjoy the area? When we do have kids, we want them to be raised in the best environment we can provide, but do we buy in that area now or down the road?
These are just some things we are questioning right now, but for now we are going to enjoy our year here in our new surroundings and try to find that 'it' place..but how do you know it's right? haha
Although when I asked John, where do you think you will be the happiest, he replies..."San Diego."