What would I need to get to link seven projectors together as one?

At my church, we're about to doing some major stage redesigning. I've seen it done before with a "TripleHead2Go", to link 3 separate projectors together, but I'm curious if it would be possible to link 7 of them together. We plan to have 5 running along the back of our stage, 2 at the very front on the left and right side. Is it possible to link all of these screens together with one computer? I know it would have to be a pretty powerful machine, but that's fine. We're just trying to figure out a budget. Thanks!