With Commutair getting E145s at IAD, you definitely want to put them back on your list.
Another one you should probably look at is PSA. They don't have a DC base right now, but they do have a sizable operation there, and a base may be coming in the future. In the meantime, the commute to Dayton, Cincy or Charlotte will be pretty easy. And I'd say they've got a more stable future than Air Wisconsin or Republic.
I'm not saying they should definitely be your first pick, and right now I'd still probably go with Commutair over them for someone in your position, but they're at least worth investigating.