Welcome to the forum,
Of the speakers you have listed I have only heard the Klipsch R-610F. My father made some changes to his media room and wanted to change his front three speakers in a 5.2.2 setup. I was able to find a good deal on the R-610F so I purchased three for his LCR speakers. After setup and calibration I cannot believe how good they sound considering the money spent. I set the crossovers to 80hz so anything below that goes to his subs. Sounds great.
Hopefully others will chime in that have heard the Polk of JBL systems you mentioned.