I am just putting together my first Home System and looking for suggestions on a sub. Here's what I have so far: 'm configuring my first home audio setup, fairly low end, but I'm looking for something to deliver good sound for both music and movies. I have an Onkyo TX SR-505, and I'll be using a pair of Monitor 70s and a CS2 and was wondering which subwoofer to use. Here are a couple of things I'm looking at Klipsch SW-350(31Hz), Boston Acoustics CSSUB10B(32Hz), YAMAHA YST-SW216BL(25Hz), or a Polk 505 (28Hz). Any opinions on these?