The sub will be going into my finished basement which is 15ft wide and 30ft long. Which sub should I choose? The SVS 20-39isd is $599. The PB12-isd is $599. The Velodyne DLS5000R is around $600 shipped depending on who I buy it from. How would these subs compare in terms of depth and spl? I've heard the velo at a local dealer and I was amazed by the forceful bass that it could produce. I was just wondering if the svs subs could give me any added performance? Thanks!