It's Polk Audio, not polka
My opinion is those speakers will be too small for your size room. You could go to Newegg and get brand new Polk Monitor 40s for $150/pair, Monitor 30s for $110/pair and a CS1 center for $90. Then get a Polk PSW505 sub for $250. You're still ahead if you have to pay full price for the receiver.
It's Polk Audio, not polka

My opinion is those speakers will be too small for your size room. You could go to Newegg and get brand new Polk Monitor 40s for $150/pair, Monitor 30s for $110/pair and a CS1 center for $90. Then get a Polk PSW505 sub for $250. You're still ahead if you have to pay full price for the receiver.