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If you go polk, go with 10/12s!!!! I own the 8 and they're fine for movies, really clear in voices and sound effects. But there's a catch for music though, especially rock and metal music. The 8s have 3 drivers. A tweeter and 2 mids/lows. But the 2 mid/lows are NOT crossed-over. That means that the two mids plays mids. That's too much! And then you're left with a tweeter that has to get louder to mach. Very harsh at high SPLs
The 10s Have 4 drivers I think. 1 tweeter, 1 mid, and two lows that are all separate. Buy the 12s only if you don't get a sub. I've listened to them side by side with the same amp and the difference is huge! I'm really disappointed in these speakers for music reproduction. But for movies though, EXCELLENT! I own the 5.1 set (the .1 being a 10inches velodyne). That why I bought a stereo sound system hooked up on my computer for music listening. NAD with Energies.
Get out there, find audio stores that you didn't even knew existed and LISTEN, LISTEN, LISTEN
That's my two cents and a half