Here are 3 suggestions:
1st) J&G Steakhouse
www.jgsteakhousewashingtondc.com
2nd) BLT Steak
www.bltsteak.com
3rd) Charlie Palmer Steak
www.charliepalmer.com/Properties/CPSteak/DC/
Washingtonian Magazine (
www.washingtonian.com) has a good restaurant section you can search for more info.