Hello. I have a Tannoy Profile 637 speakers and I want to buy a new receiver. I was thinking about a Marantz SR-5400 or SR-4500. At this moment, I am only going to use it for stereo music. I have some questions. I want to know: 1.- The differences between the SR-5400 and the SR-5400 OSE. 2.- Which of them is better (SR-5400 vs. SR-4500) for my speakers. 3.- If they are good for stereo music. Thank you very much.