I have the Pioneer speakers in question here. Have the two floor-standers, two bookshelves as my rears, and the center. I'm using a Denon AVR-791 and a Bic F12. When I put this system together, it ran me about $900 or so. It sounds great. I found these speakers to have a much warmer and fuller sound than the Polk's at double the price, and the low end Klipsch towers at Best Buy. I've had my system for about 7 months now, and it seems like it's sounding better every day.
Last I saw the towers were only $99 for the pair on Newegg with a code. They sold out quickly. $200 for the pair is a steal in my opinion. Best Buy should have the 5.0 package on sale for $285 as gbc3 stated.