I've never heard the EP500 but ahve played with the PB12+ & SB-13+ before....

for combination of movie + music, PB12+ is a true big subby killer (and a pin to move it as well at 60kgs)

SB13+ is more sutable for music, fast, accurate but the low end not as good as PB12+

I have considered PB12+ b4 decided on my PC12+ due to the weight and deep box....the PC12+ is just slightly lose out on the LFE at very Hz compared to PB12+, and it's cheaper too