I highly recommend Nile Ethiopian Restaurant at Georgia & Blair. It is right at the DC / Silver Spring border, about 2.5 miles north of Moroni Bros. They have an excellent menu, reasonable prices, the best Ethiopian food I’ve had around here, and a nice casual atmosphere (spotlessly clean but not fancy). It is easy to miss, as it is in an ugly gray brick building, adjacent to Nile Market, and you enter the restaurant from the side, so you are unlikely to notice it unless you are looking for it. They obviously have lots of good meat offerings (vegetarian options are sometimes kind of sparse at Ethiopian restaurants around here), but my vegetarian friends have been very pleased with their vegetarian offerings.
For carryout, Teddy’s Roti Shop on Georgia (between Fern & Geranium) is also excellent. The thing they’re known for is the Dhalpourie.