I currently have just a stereo set up and am looking to add a subwoofer, I will be adding a center and towers to the front eventually. I am looking at the Sunfire true subwoofer super junior, REL Q 150 or maybe Q 201 (My dad has this one). I don't have the luxury of getting them side by side to hear them. What are the main differences going to sound like or feel like. I have Quad 12L bookshelves right now, and will be getting Quad 22L floor speakers. I am hooked up to a Marantz SR7400 AVR. I am actually not familiar with SVS subs, but am open to it in the $1000 price range. Any other suggestions would be great.