Hi all, Im hoping someone may be able to help me out. I am looking to upgrade my sound system and I thought a good route to go down would be upgrading to Bose, as the Black Edtion has. I just need to know, how easy is this to do? Secondly, is there a reason why there is such a proce difference for the systems on Ebay? They range from Â£130 to Â£400 and they all seem to have everything included (spreakers, amp, sub). Any help would be great!