My dad recently bought a plasma for the living room and my mom loves the idea of flat panel style speakers to go next to it. We already have a Polk RM6700 system (http://reviews.cnet.com/Polk_Audio_RM6700/4505-7868_7-20378291.html), but my mom likes the idea of speakers that run the length of the TV instead of just little buds next to it. We're happy with the Polks, and my dad doesnt want to spend much more money, so I'd just replace the left, center, and right channels. I need a recommendation on a speaker that's affordable (say under $200 retail per speaker) and will outperform the polks. Any recommendations?