Don't forget THX is working on putting a plaque together that will be sold on their site. Do a seach, the thread should turn up. Probably cheaper to wait unless you need it asap.
I've been in contact with THX for a couple months now about a wall plaque for home theaters. Their Marketing Director assured me that they were in the design stages and should have more info in about 5 months. He said that he would email me with any updates.