well for vid editing your going to need at least 1gb or ram to be conformable while doing your job.
sadly at the moment the biggest laptop HD is only 100gb@ 5200 rpm, that is ok, but you want a 7200 rpm drive.
i would suggest a 15 or 17 inch apple powerbook, because for free they come with a movie editor called imovie and if your willing to pay you can get Final Cut Pro and that is use widely by editors.
the powerbooks have S-vid and DVI outputs and the 17 inch has dual dvi and they have optical audio out/in as well.
you will be wanted to get a a external firewire HD for you work. i currently edit on a 15 inch powerbook with 512 ram and 64 mb vram, it does the job, but with large files it can get slow i should seriously get my self another ram chip.
here is a sales site http://www.apple.com/powerbook/
do a google for reviews you will find thousands