I think...
...you have been given excellent advice already. Second guess it at your own risk. Athena's offet a heckuva lot of bang for the buck.
Since you stated a range of $500, why are you considering a $177 system?
If you want to consider the "building block" approach, therare tremendous buys on Athena's other speakers as well. A pair of AS-F1's for the front R/L and a AS-C1 center can probably be obtained for < 500. Add a sunb abd rears later.
I know that a pair of AS-F2's can be bought for $400. The center seems the be set at $180. check out
http://www.audioadvisor.com or your local Best Buy for these. BB might have better prices, though.