I'm a bit out of the loop with SoCal now for techno. Out of the places mentioned, I'd think SF would be the best. The SPAZ, 5lowershop and Otherworld collectives have sounds all across the spectrum and do stuff on the regular.
In Portland, while I lived there for a short stint, the biggest scene seemed to be around House. You'll bump into some kids that are into to techno or harder varieties of music but not so much that you'll hear it in a space on the regular.