Good day! I have read the following thread: http://www.avforums.com/forums/subw...955704-rel-b1-vs-svs-pc13-pb13-problem-6.html and found it very informative. Thanks to those who contributed. My question is, should I purchase an SVS 13-PLUS, SVS 12NSD, Rythmik F12SE or used REL R-505 for a medium sized room. It will be paired with CM8s, CMC2, and CM1s. I am looking for a musical sub, but will be using it for HT as well. I will be adding a second identical sub down the road (or right away). I know that RELs are usually a lot more money, but if I get a used one, would it be better value than a new SVS or Rythmik? I really appreciate your help on this. Thanks in advance.