Hello every one, new to this forum and modern A/V equipment for that matter. I have just purchased a few things and wanted to get some input. I realize this is a very broad subject but I want to make sure that I didn't waste my money. I have picked up a Pioneer SC-72 (witch I may return and buy on Amazon for $400 less) and some Martin Logan speakers. I went with the electromotion esl fronts, motion 6 center, 2 motion 2 rears and a dynamo 500 sub for now and will be adding 2 sides eventually. The speakers were a good deal, buy the fronts and sub and get the rears and center for free, but the receiver I probably paid too much for and I want to know if I should return it and buy off amazon or is there something that I could replace it with that would be better? I like all the features and it sounds great and it will even accommodate a 4K TV in the future but can I do better for $800? Thanks in advance.