Okay, I've narrowed my camcorder search down to two. One has a 80gb HDD and claims "up to" 33 hours The other has a 120gb HDD and claims "up to" 50 hours. Obviously this "up to " estimates are complete crap as I want to use the highest possible quality settings for HD so the things I film look good. How long can hard drives of that size record the highest quality HD for ? The cameras are both Sony. Thanks in advance.