Hi - I've just stepped into the world of Blu Ray (am due to get my Sony KDL40z4500 and Blu ray BDPS550 installed at the weekend) and have collected loads of DVDs over the past few years. My query is whether the upscaling abilities of the BDPS550 will significantly improve the picture on my existing DVDs or whether for my favourite films I should buy them again on Blu Ray. Will I notice a significant difference in terms of picture and sound, or will the upscaled picture be basically the same?