Joe,
Sounds as if you are building a pretty nice computer for what you want it to do. I don't even know if we have a store here any more that will sell you the case and components to build your own. There used to be a couple but I know that one of them has long since gone out of business. I do know that there are a couple advertised in the phone book that will build one for you, but I am not sure just how expensive they are or how good they are. I kind of like to specify the type boards and such that I got in mine and now most of the major brands seem to want to limit you to what they are offering. Probably to keep the price down.
Ron