I currently have an Onkyo 809 receiver. It powers polk audio rt35i front left and rights, polk cs245i center, and polk rt25i surrounds. I also have a polk psw505 sub. I want to upgrade my front L/R speakers and then move the rt35i to surrounds and move the rt25i to rear surrounds. What would work well here? These are older models. I don't want to spend much money and I'd prefer not to replace my center speaker. Is there a newer polk speaker that will match with my center well or should I be looking on ebay and craigslist for an older set of rt55i. I'd like floor standing speakers for my front L/R so maybe rt800i? some input, thoughts, and recommendations would be great. I do about an equal mix of music and home theater....maybe 60/40 home theater.