They both have dual 6.5 drivers, heck they even look similar. My local Best Buy has a whole bunch of the Klipsch, and I heard them in the store. They sound pretty good. The RTi8s are of course more expensive, and I had owned them before and liked them but they were ddefective (I think there was a bad batch when I bought mine).
If they are very similar sound-wise, imaging, construction etc, the Klipsch is my choice, plus I think it looks better, though they are both slim towers. If not, I'll try the Polks again. Any advice would be appreciated.