Among the ones I tried:
Bilbo Baggins - American/continental it has very extensive collection of wines for those who care
http://www.transmediacard.com/MoreInfo.cfm?Code=902598
RT's - seafood
http://www.washingtonian.com/dining/Profiles/RTs.html
Le Gaulois - French
http://www.washingtonian.com/dining/.../LeGauloi.html
For additional info check Washingtonian magazine's dining pages for its top 100 and top cheap 100 restaurants.
http://www.washingtonian.com/dining/default.asp
Enjoy your stay in Alexandria! Old Town Alexandria is one of my favorite neigborhoods in Washington metro area.
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Dan