Thanks for the insight guys. Basically, I'm going to create two setups in my house. I selected the HT2-TL's to put upstairs in my office area as a full range speaker, because I don't have the space to put a sub in there with my wife and I both having our stuff in there. Downstairs in my basement, I'm going to have ST set up for mainly tv/movie watching, although if I'm down there I'll just listen to music as well too, maybe 10-20% of the time. For the longest time I had been intrigued by the cyclinders that SVS offered and heard raves about the PC13 Ultra. Form factor wise, it would work quite well in the basement, and perhaps it has more output overall than the SongSub spec wise. The SongSub main advantage being very well matched to ST (I would think) and much prettier (will match my ST), but I hadn't heard much about its performance at all. Its also a passive radiator rather than ported, so it will be quiet. Overall, I want a sub that won't bottom out on movies at moderate volumes, and is musical enough to not get in the way should I kick it on occasionally with some tunes.