I currently have a Sony STR-DB1080 6.1 amp which I have been using in 5.1 mode and have been happy with it for 8 years. I have a couple of questions as follows: 1. Is it worth upgrading to a new 7.1 HD amp? (not sure I have room for even more speakers) 2. I have ordered a BD-P2500 bluray with built in 7.1 decoder can this be set to output HD sound in 5.1 with any benefits? I'm a bit of a numpty when it comes to HD sound so sorry if this is a daft question. Any help would be appreciated.