Peking Gourmet Inn is out in Falls Church/Bailey's Crossroads. IIRC It was a favorite of Pres. Bush (41). I have mostly had lunch specials there, which are usually not too bad. The Kung Pao is not too oily and not overly sauced. We do carryout for lunch from there fairly oftent - Some of my coworker's favorites include the Szechuan Beef Proper, Jade Chicken, and Fresh Garlic Chicken.
Based on my semi-recent meals at both City Lights and Meiwah (neither one was very good - City Lights was horrible), Peking Gourmet is the better choice. That being said, I prefer Full Kee (Bailey's Crossroads location).