Pho Saigon in Milpitas, CA on Landress just off 680 is a good place, good quality meat in their pho, quick, friendly family service. Cash only, but prices are good, too. I sometimes stop in if traffic is bad heading from SJC to the valley.
http://www.yelp.com/biz/pho-saigon-n...house-milpitas
My very favorite Pho restaurant in Silicon Valley is Pho Vi Hoa on El Camino between Palo Alto/Los Altos/Mountain View. The best service ever in a Vietnamese restaurant, really tasty pho and great spring rolls.
http://www.phovihoa.com/