anybody heard the TSi400 in action?
If the LSi Series is available, this is the best of the latest Polk. LSi7, LSi9 (bookshelves) LSi15. and LSi25, their center and the FX/surround. All of them uses the best Vifa tweeter that are usually found on expensive speakers. Other than that, go Vintage if you can find it usually the SDA Series. I have numerous Polks and few Klipsch's and all are vintage except the LSi9. Although LSi9 is is bookshelf, you will be surprised for it is power hungry. This speaker is 4ohms and should be driven by high current amplifiers and should go to hours of break-in period to really appreciate the sound. I have mine driven by Outlaw RR2150 because this is one of the amps that is like built and a good match for LSi9. Be careful not to drive it with 8ohm amp or you amp gets fried. I stick with Polk audio since my first purchase (1988) of the Polk RT12 never failed to impress me. I have only one set of Klipsch Towers (1995) as a test to compare with my Polk but Klipsch did not impress me that much.
My Polks:
1 Pair of LSi9 Bookshelves
2 Pairs of SDA-CRS
1 Pair Monitor 4
1 Pair Monitor 10
1 Pair SDA 1C Studio Floorstander
1 Pair of RTA12
1 Pair of FX surrounds
My non-Polks are Klipsch, Haflers, Velodynes. So, if you go Polk, get the LSi Series since the rest I mentioned are vintages and are most sought-after models mostly available on eBay and they are not that cheap--and so are the LSi's. I have driven these Polks with several amps (Bryston, Outlaw, Onkyo, Acurus, Yamaha MX-1s, numerous Haflers, Phase Linear, Adcoms, and Nakamichi's) and never thought of switching to another brand of speaker. Besides, Polk has an excellent customer support for all their products, old or new.