Check out Sound Solutions in Chantilly, Safe-N-Sound in Manassas and Audio/Video Solutions in Laurel, MD. Like I said earlier, qualify the installers to make sure they'll do a good job. Also check out Myer-Emco (10 stores across the DC area). I'm not sure if they carry Clifford in stock but they might be able to get it since they are a DEI dealer. The advantages with Myer-Emco are that they have been in business longer and are stronger financially. All of the shops guarantee their work but if they go out of business in a few years then it doesn't matter as in the case with the two companies I used to work for.