No doubt, Jive Sound is the place to be. Chucks's is a huge store, and is a staple in the DC music scene, but with the exception of Ken Smith stuff, it doesn't have an especially exotic selection (which is perfectly fine, if you're looking for something basic and solid). Jive Sound has tons of interesting stuff, and dealing with Jong is about as cool as it gets.
Go to
www.jivesound.com to check out Jong's stock, and get an address.