Just wanted to canvas people's thoughts and opinions on a possible replacement for my ageing GSW12 sub. Will I have to spend nearly as much again as the GSW cost me back in the day to get similar performance? I like what I hear about the BK P12-300SB or maybe the XXLS400 or there's even the SVS SB-1000 at £450. They all sound like they offer great performance and at quite reasonable cost too. A common quote is that they are all 'fast' and upbeat subs which I have a feeling my current sub isn't partially. So, my second question is are any of the above likely offer at least as good bass or perhaps even better than the GSW12?