Before reading the ravings here about subs from SVS, I had not heard of them. But I now understand they are one of the best going! Can anyone tell me if the new PB10-ISD is a much better sub than the BK XLS200. Having looked on the SVS website I know they look the part, but I understand they are quite expensive. I would also like to know if I can buy one in the UK, or where it is best to order from in the US. Any idea how much one of these beasts would cost me? Thanks.