re: Dennis S
And a quick primer: Generally, outside of Thai X-ing (to which I haven't yet been personally) Thai inside DC is Americanized. Wheaton and Columbia Pike in Arlington are the top spots generally speaking. Outside of Eden Center, and not going into a pho discussion (save for one point) Nam Viet and Minh's are the other most often referrred to.
The point about pho is that around here there's a general rule that if the pho is good, the rest of the menu probably is not, and vice versa.
If you're a further outlier in any direction then there are other options (for instance there's actually pretty decent thai offerings in Reston/Herndon/Sterling).
Falls Church, VA, USA, Falls Church, VA
2500 Wilson Blvd, Arlington, VA 22201
Nam Viet Restaurant
3419 Connecticut Avenue, N.W., washington, dc, DC 20008