I've heard the Polks in a store once, so I can't really comment on them one way or the other. Having said that, The price range you're talking about is exactly what a pair of Focal 836v floorstanding speakers cost. I've owned mine for about a little over 6 months and love them more than the day I brought them home. I've heard speakers that sounded both "different" and "better", but the "better" was always either a much more expensive speaker or much better supporting equipment than I have. Try to find a place to listen to a pair and see if you don't like them.
Where to go after Polk LSI15's
As the new year approaches I'm beginning to get the audiophile itch---something I haven't had in over four years, which is the longest I've gone without the itch. I have a combination of AVA and Odyssey electronics,and Polk LSI15's. I'm thinking of upgrading the Polk's and would like to get suggestions as to the next logical speaker upgrade---particularly from former LSI15 owners. $2,500 - 3,000 range max. Thanks in advance for your feedback.