i would say its pointless to keep the 7-8-900mb files because the vga screen cant handle those full resolutions anyways so its a waste of space. I would use a good video converter and put them into vga resolution and save yourself space. My vga movies are only about 300mb or so each
ive found this free program
http://www.pocketdivxencoder.net/EN_index.htm pretty good for converting video. its not the most full featured but it works and its free