I know people working in the US government and working for intelligence agencies from both schools.
As far as resources go, they're pretty similar at the undergrad level. Admit rates to law schools are also generally quite similar, and if you look at the student bodies at top law schools they're about the same (maybe a 5% or so difference at most schools).
Berkeley's prestige is definitely not limited. Despite some issues that get brought up on this board, Berkeley's a really really good and really really well respected school. I wouldn't worry much about that (and anyone in the government will know the quality of their IR programs.)
UCLA is no more materialistic than Berkeley, if you ask me. I know materialistic people in SF and I know materialistic people in Berkeley. Both have their ups and downs. There are tons of activist groups at UCLA, and tons of activities to involve yourself in year-round. Don't forget that UCLA was also a hot bed of protest during the 60s and 70s!
If you want to do intelligence, though, why are you worried about law school?
I think that you should go where you think you'll be happiest. Neither one will significantly hurt or help you more in the short- or long-run.