I grew up in the DC Area and lived there till 2012.
I mostly lived in the Maryland suburbs, but did live briefly in northern VA; since I am in the computer space I did a lot of work in and around the whole area.
In general, traffic sucks bad for the whole region. If you live out towards Martin State like suggested earlier in the thread, rush hour commute to downtown DC will be measured in hours, one way. So I would suggest you look much closer at where and how your schedule will work. As an example, I used to work in Tysons Corner VA, and live in Germantown MS. 27 miles door to door. Miss rush, and you could do it in 30 minutes, hit traffic wrong and it was an hour and half.
If you have flexibility, you can consider looking further out and take the commuter rail lines in.
Tim