Slightly off your question, but you indicated that an immersive movie experience was important to you. I just upgraded from 5.1 to 7.1 with a Yamaha VX-R2400, just got everything hookup Sunday afternoon. First thing I put in was LOTR 'Fellowship' extended version with the DTS-ES sound track, which we previous had thought to be amazingly good in the 5.1 system. The difference was remarkable, and there was a far greater feeling of being in the movie. My room is much smaller than yours, but I'm also setting up a '10 year system' and would strongly recommend 7.1 based on what I'm hearing. The Pro Logic IIx, likewise makes music sound very good.
