I got the polk rm6800 speakers. I am yet to buy the receiver. Can you suggest one among AVR240, TXSR503, VSX-515 or VSX-815 That is the order of its pricing too. What do you suggest for subwoofer cable, speaker wire and plugs keeping the cost in mind. Please be specific. I am not sure if it comes with the receiver or if I will be able to use them. Thanks in advance.