It's cool if you liked the combo of Polk + Yamaha. In my opinion since yamaha is little bright pairing a warm sounding speakers would be a get bet ( like wharfedale). Polks are considered to be bright sounding speakers but again it all depends on you only.You can even think of energy take classic 5.1 which are rated very high on performance. In BA HTS 2310 and energy you would probably get the natural crystal clear sound. one of the FM is really happy with HTS 2310 + Yamaha AVR.
How is Denon x1000 vs yamaha 477?