Let the hive mind of Engadget get that for you.
"I need help! I want a small pocket camcorder but I'm not sure which one to get. I don't want to fall into the hype of the Flip because I worry two hours won't be enough. What should I be looking for when considering a small camcorder and where can I get a good quality one with expandable memory? Thanks!"
Why do we need a 4k res when the biggest TV the mass consumers use is 42". Unless you have a >100" screen then you can tell the difference. It's like asking "Let's have all the movies in IMAX".