Huzzah Hobbies is right off of
Rt. 7 in Ashburn. The owner, Chris, is very friendly and his store is very well run with products from every major miniature game. A couple months ago he took over the unit next to his to make an area exclusively for gaming so there is almost always room (he can host a
MtG release party and
40k tourny at the same time). I believe
40K night is on Wednesday, but there is open gaming just about all the time. There is also a big Warmahordes and
FoW crowd there.