I have a budget about $600 for a sub. I almost bought a Martin Logan Dynamo 700 for $700 last week. It sounded pretty good. I read on here that at that price I can get something a lot better than the ML. Would you guys please recommend me something that is medium size because I have a room of 10.5x30. I am looking for a sub that would produce tight clean bass where I can actually feel it. I have read SVS and HSU are good sub, but I can't listen to them because they are only sold online makes me a little nervous about ordering them. Please help me pick one.