DP,
you might consider a Heresy III for a centre and even surrounds. You have a big room. That setup would sound awesome.
I also have for sale a pair of velodyne DD10 Plus subs that I use with the LaScalas. They work amazing together.
before the Velodynes I had a JL F112 and the Velodynes blow it away and they have auto room correction.
We just missed the bridge collapsing by 2 days when we came back from camping.