I would not get the little Polk setup. I would check out the Jamo S 406 5.0 setup at vanns.com
http://www.vanns.com/shop/servlet/it...06-hcs-1-black
And then look at either this receiver, you are now in budget with a better system.
http://www.newegg.com/Product/Produc...82E16882105433
$249 for the speakers and $229 for the receiver and you have a complete system for $480
This is another receiver to consider, or the 4003 for $50 more, they are really good receivers and offer a lot for the price. the 80 watts per channel will outperform all others that state 90-120 at the same price range.
http://www.accessories4less.com/make...urround/1.html