Vie,
Well I will most definitely pray for your family; it sounds like a tough situation. It is always difficult for kids to handle a big move.
I have attended the mission that Epiphany has in Montgomery County, and it is very nice and a good group of people (one or two of them are on this forum). I've never been to Epiphany, though.
I would also recommend (as Neil did) Holy Transfiguration in McLean. I'm not sure how many teens they have there, but they sure don't have any Latinizations!
My own parish in Gaithersburg has a wonderful youth group that is very large, very active and well catechized, but alas, it is Roman (nobody's perfect!
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).