The qualities that make for a good sub are, for the most part, independent of the speakers you're using. Since your Pio's are good down to 80 Hz and the subs listed above all go up to 80 Hz, any of them should work fine with your speakers using a standard 80 Hz crossover. Go through your receiver's Audyssey setup routine after you get the new sub installed. My post-Audyssey setup preferences are to enable "Audyssey Flat" mode, ensure that all speakers are set to "small", crossovers are all at 80 Hz, and Dynamic Volume/Dynamic EQ are set to "Off". I also increase the subwoofer gain several dB over what Audyssey chooses. Play some music with good low frequency output after you've tweaked to ensure that you're happy with the settings.