What video do you want to shoot (SD or HD)? Do you shoot inside or outside, and if both, what do you do more? How should it store the recorded footage (HDD, flash memory card, tape, DVD, ...)? What do you want to do with the video afterwards?
Give us as much information about your future purchase as you can, thus it is easier for us to help you better and more specific.
Can it be a used camera?