Normandie Farm in Potomac, MD is where I like to take visiting out-of-town relatives. Their buffet is large enough that everyone can find something they like.

http://www.popovers.com/

This place has been open since 1931 (I believe their claim to fame is that they invented the popover) so it's more traditional than hip... but I generally find that works better for my older relatives! At $24/adult, it's more reasonably priced than some of the other area Power Brunches. The staff has also been very accommodating when I've held meetings over brunch with a group of 8 - 10 people.

I've visited Cashion's Eat Place several times for brunch and just wish they had a menu with more breakfast-y selections. The atmosphere is neighborhood-y and light so I'll sometimes go there with younger friends. I just have to remember to be in more of a lunch mindset next time I go!