I mentioned getting a used Sony Digital8, it's hybrid technology using analog original Hi8 8mm cassettes to record digital DV quality, 500 lines, works as a standard camcorder would back in the day, if you get the right models with most feature support, where conversion to digital is done in camera, on the fly, and they work like a hand held VCR in many respects, sans timer. For HD though, your choices are limited, a DVD Camcorder CAN hook to PC via USB and become an external DVD RW device, I think that's pretty cool too, again, I stick with Sony stuff for that though. If you're interested in HD shooting and playback on the fly, I bought one Samsung, and two Canon still cameras circa 2009 that allow 720 Progressive video or lower res, and the Canons both have mini HDMI, while the Samsung requires data be moved to a PC or Laptop allowing the HD playback, the HDMI video direct from a Canon on my Viore display is somewhat sketchy, but looks fine playing back on a laptop with enough horsepower, so again, I think there's something cutting down the quality for a direct to TV approach.
Manudt, Component breaks video signal delivery to three components, hence it's name at the time. However, it can carry both analog and digital, so digital would be the higher HiDef compliant signal. I would comment on HD (1080P) handhelds if I owned one, but still too expensive for my taste