I ordered a factory remanufactured JBL SCS135-Z complete Home Cinema speaker package. But later they emailed me that the item has been out of stock and would like to offer a new JBL SCS135SI as a direct replacement. They also said that The SCS135SI is virtually the same system and specifications except for the subwoofer which is larger at 10" vs 8" on the prior model. It looked like that I got a good deal. But after I logged on to their website, I found that they has the same size. In addition, I also saw the SCS135-P. I am totally confused. Who can tell me the difference of them? And what should I do?