I am looking to replace my blown infinity speakers. I have an Infinity sub woofer BU-120 120v 200W and an Infinity center speaker 10-100W-8ahm Model cc-2 type 332141 and a Denon receiver AVR-3200. I am not audio savy at all and hate going to store when I don't know what they are talking about. Any suggestins on what to buy? I am looking to spend under $400.00. Bookshelve are fine with me.