Big Dub the Polk RTi/RTiA series is decent. I have found them to be very fatiguing and the tweeter can get down right harsh even at moderate volume levels. The Polk LSi/LSiM is much better overall, but also much more expensive. In that specific price range, there are many other better choices inmho. However, Polk does have a half off sale once a year or so on the LSiM series which does make things much more interesting. Even then, there are still some other brands to consider. Are these the ONLY two speakers/brands that you are considering?
Cheers,
Phil