I have a Kenwood VR-507 receiver which is part of the HTB-504 HTiB. I have upgraded the front speakers as well as sub. As a result, I have a complete set of extra speakers lying around. I am considering selling my Kenwood and getting a Pioneer vsx-d811s and using a 6.1 setup. This should cost about $100-$150 depending on how much the Kenwood goes for. - is the improvement from 5.1 to 6.1 worth it? - is DTS Neo 6 better than PL II - is the amp section of the Pioneer comparable? Have read many good things here about the 507's clean power and certainly have no complaints Other not so imp reasons for me - - future expandability with preouts for all channels. It will be at least 1 year before I can afford a separate amp - component switching as I only have one source (dvd) So basically just trying to find out if 6.1 is THAT much of an improvement to justify the upgrade.