Is there any difference between these two? OK, the SL100 is slightly more expensive (£20 or £30), but is it correspondingly better. The 550 has a 108 MHz video converter, the 100 is 54. The 100 weighs a kilogramme more! How is that possible in such a small player? Has anyone compared the two side by side? Should I just go with the cheaper one, which seems to be the only one that has the titanium finish I want, anyway..