Fxia6 surrounds (better then rtia3 for surrounds)
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I gotta say I love it, the towers do have decent bass, I have no sub yet but saving up for one, but the a7's even tho leave me yearning for more will satisfy for the time being bass wise. This setup is awesome for movies and good for music.
My sugestion to you is to check out polk's eBay store, the a'7s are $399 each there refurbished and still carry a 2/yr warranty. And all my speakers look and sound brand new. The ebay store is highly recommended in the polk forums and I have only heard of one issue which was resolved quickly and easily.
I also suggest you look at the rti line which was replaced by the etia line, they just have different aesthetics
Csi5 = csia6
Rti6 = rtia3.
Remember that best buy also does price matching if you really want to buy new. newegg and amazon have sales on polks all the time.