Glad you enjoyed mass there, OP. But you should note that just because there was a car with an Obama sticker on it doesn't mean that they live in Byeforde or even nearby. I attend mass at HR and I live in Olney. My siblings attend HR and they all live in Silver Spring. You might have parked next to one of our cars
Byeforde and CCV are nice neighborhoods --- but whether or not it will meet your needs is up to you. You should know that most of the families have SAHMs and are conservative --- and they all seem to know each other and have long histories (b/c kids who grow up in those neighborhoods tend to move back in as adults). I would spend some time driving around the area to see how many kids are in uniform, see what the bus stop looks like (how many kids, are they around your kids' ages), and see how many Romney stickers are on the suburbans (if that matters to you -- maybe it doesn't).
Glad you checked out the church --- it is quite lovely (much nicer than my local parish, so it's worth the schlep).