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The difference in performance is nothing as the 3500 and 108 are the same speeds for everything, apart from the 3500 does 48x CD and the 108 does 32x. I have been burning at 16x with my current Sony drive as the discs being burnt at 24x which is the max on the Sony were being corrupted. So to be honest CD speed is not important as a nice reliable drive that works with all the media etc.
DL will allow you to keep all the extras, menus etc, plus longer films like Lord Of The Rings wont need compressing.
(For reference, 90 minutes == hollywood action trash)