I'm setting up my first HT system and want to get the best sub I can for around $300 shipped. I've been thinking about Sony SA-WM40, JBL PB-12, AudioSource SW-15, Velodyne CT-100 so far. I will probably be using the system for 70% HT and 60% music. My setup: Onkyo TX-SR600, 2 Infinity SM-100 (old!) fronts, and BIC center and rears. I don't think my ear is good enough yet to really test all the speakers and decide on my own, so any advice would be greatly appreciated!