One on the bars and one on the helmet helps with depth perception and it is good to always have on to use as a back-up. Worldwide cyclery usually has some good deals. The night riders charge via usb and don't need additional batteries.
Newbury Park area of Thousand Oaks. Will be on average 10+ degrees cooler in the summer. Schools are better, and traffic is a breeze compared. Feels like a community not a city. I worked in Valencia for 15 years and looked at moving out there, but HOA and CFD costs are insane.
Once in the park from there it is another hour to the valley floor. There is also a small brewery in Oakhurst with good bar food. Southgate Brewing Company.