I am trying to find a good sub to compliment my Polk Audio RTi38 Bookshelf speakers and Polk Audio center channel. I just tried the Velodyne VRP 1200, and currently, it sits by my frint door, ready to go back to the store in the morning. I just did not like the sound of it. I am looking at either the JBL Northridge E250 or the Infinity PS 12 (my brother has the PS 8, and I love the way it sounds for both music and movies, very tight, clean base) Both of these subs get good reviews on websites that I have looked at, and both are in my price range. Which one is a better sub, or should I go with a different brand like maybe Polk or try a higher end Velodyne?