Hello!!
WELCOME TO VIRGINIA!!!
I would recommend Reston over Herndon. I have been in Reston since November 1997. I LOVE my location!! Our school is a Spanish Immersion school where the kids are immersed in Spanish half of the day.
You will also find more options with commuting for your husband. My husband commutes to D.C. every day and prefers that over driving. Especially with all of the changes happening right now with traffic. It also depends upon WHERE in McLean (Tyson's Corner) your husband will be working!!! Please feel free to message me privately and I can help you!!
You will find VA much different that CA - our summers are hot and humid - and right now we are in the middle of a record heat wave. Unlike CA - you will NOT be close to the water - in Mountain View you are a hop and skip away from the Bay Area. In VA - you will have to drive to get to the Potomac or the beach and East Coast beaches are FAR different from West Coast beaches.
There is SOOOOOO much to do here - you can take the metro (it's about $1.25 per person) into DC and go to the Smithsonian (it's free). You can have picnics on the National Mall (we've done that and played frisbee afterwards!!). Our Barnes and Nobles and Books A Million has Mommy Group days to come in and read - as do our local libraries.
We have LANK (Lake Anne Kindergarten) that is half and full day school for children (sorry, I don't know the prices or ages they take) http://www.lankschool.com/
We have Kindercare's and other typical daycare's. Our FULL DAY infant care at Kindercare is $269 a week - I THINK!!! It's been a LONG time since I have needed infant care.
I belong to the W.'s Club gym in Chantilly. They offer child care for $5 per child and your child is in a secure location in the same building as you. I pay $65 a month and get a FREE massage EVERY month!! (yahoo!! my reward for working out!!)
I hope this helps you!!!