Unless you are going to build your own, I've chosen a case w/ power from Pittsburgh modular. They have a few versions from small desktop cases to large 6u(two rows) at 104hp per row. They also have a cheap "in/outs" module with a 1/4" input which might help you. I've been researching for months and still haven't bought anything yet. Its a lot of info and companies to sort through, I know.
-michael