Did you visit UCSD? I was accepted to both Stanford and UCSD (still...still waiting on UCB), and I was much more impressed with UCSD's structural program. Stanford's facilities are childish at best, which was surprising considering that it is a private institution. In addition, UCSD has about four times the number of structural faculty that Stanford has and about the same number of students. My impression was that if you wanted to do research (both computational and testing based), UCSD is a far better school. If you just want to do straight coursework (Masters), it seems like a wash, with both schools having good course offerings. However, UCSD has a far more diverse structural program (considering that their Structural department is independent of their Civil Engineering department, hence UCSD not being ranked). Thus, you can take structural classes that are not applicable to civil structures.
And then there is the price tag. Stanford's cost seems too high to be competitive. However, as you mentioned, it would be close to where you live, so that really must be a factor. Obviously both are good schools, but I got the feeling that Stanford relied on their name to draw students instead of the merit of their structural program. I could definitely be wrong, but those were the impressions I got from attending the grad event for both schools.