If HD video is your primary concern, use an HD video camera. That's what they are designed for. Some of them even take moderately decent still images if you just want a quick snapshot now and then. HD video takes a LOT of space and as you have seen, you won't be able to store very much on a still camera's memory card. My Fuji S6000 has a decent video mode (640x480) and I use it once in a while for a quick video clip of one of my kids if I already have it out to take pictures. However, it fills up the memory card very quickly and I wouldn't consider using it as a dedicated video camera simply because an actual video camera will do a better job and will be able to store more than 30 minutes of video at a time.