Aw snap, that's a very fine center How's it sound?
If you like it, keep it! From your description, it sounds like you're going to be concerned with any mains that stick out farther than your satellites you currently have. That's a bit of a problem, as upgrading your satellites for more satellites isn't much of an upgrade -- and a matching satellite center would do a severe disservice to James Earl Jones.
I thought of a solution, though. You can get mains with the same drivers as your center, but take up even less space than your mounted satellites. Have you considered
Hsu's in-wall speakers? Just be sure to get the tweeters as close to ear height as possible.
See this page for other worthwhile advice about in-walls.