I would suggest thinking of using whatever you want for the front stage...just look into using he same speaker for the center. Typically, this works best. I have seen/heard systems with varying speakers, but typically (IMO) the results are better when they all match.

If you go with the Morels, then think about a Morel (maybe 5.25") as a center.....


Also, it might be a bit harder to get a sense of "large" realism with the subs so close behind the listener. Its definately a give-and-take on SPL vs SQ on that one. I have no idea what is right though. I do know that smaller interiors are harder to make sound "BIG"....

you might even get into the wonderful world of time-alignment....

John