On the Maryland side, go to Carderock. The approach is a couple minutes and there are lots of trees and boulders for setting up topropes. I don't know anything about those Gunks routes, but Carderock has from 5.0-5.13, so you'll find what you need.
Great Falls on the Virginia side has longer routes and, I would argue, a nicer setting. The Sandbox is one of the easiest crags to access, and it's got 5.2-5.7 routes with one 5.11. Dihedrals and Seclusion have long routes (for the area) and a lot of variety, but they can be crowded (but not like the Sandbox).
The weather in the D.C. area can be all over the pace at that time of year. Carderock gets afternoon sun and is great on cold, sunny afternoons. Great Falls VA gets morning sun.
Also, the area is known for sandbagged grades, especially at Carderock, but you're used to the Gunks, so that shouldn't be a huge issue. But I will say that many of the moderates at Carderock feel as difficult as routes one or two grades higher here in Texas, where I moved from Virginia a little over a year ago.
If you want specific route suggestions based on grades, feel free to PM me. I climbed in the region 3 or 4 days a week over the past few years and know it quite well. And I dearly miss Great Falls, so I wouldn't mind talking about it!