Sierra is not the place to go. I would also be somewhat careful about some of the advertisements you see from some schools in the flight magazines. Scour a few american based websites (flightinfo and jetcareers).
Having said that, things on this side of the pond have been picking up for CFI's / low timers recently. Don't discount the good ole fashioned small schools (if you can get the Visa etc).
If you want some first hand knowledge of places in Northern California, feel free to PM me.
Blue Skies.