Generally speaking, it is important to keep all speakers in the same family. When you hear a soundtrack of 5.1 or 7.1 or so forth the sound effects can move from speaker to speaker. Think of a missle sound going from the front speakers to the back ones. The tonality and characteristics of sound should stay the same. That is why home theater systems speakers systems are sold as a package often, but not always. Most have a center channel and low frequency speaker (driver) subwoofer to enhance this theater experience and the speaker cabinets have the same kind of drivers.
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For 600 bucks you really can't go wrong with an Aerial center speaker. For surrounds, well, not sure how much you're gonna notice an upgrade there. Maybe some Elacs?