Mission bbq (local-ish), I heard about some using Chiko in DC and said it was reasonable. Like others said, it’s the tables, chairs, etc that add up vs the food. For a traditional caterer, I’d check with Spilled Milk. We worked with them for our wedding and they can actually work with various price points vs others. You could also just do heavy passed apps vs a full dinner.

Got married this year in DC. For your size, I’d consider the American Pharmacists Association https://www.potomacviewterrace.com/. There’s also the national cathedral, which has some amazing reception spaces (no need to be Episcopalian).