One more thing to look for is the size of the image sensor (CMOS or CCD). The larger it is the better the quality of the videos indoors and in low light in general. However the larger the sensor chip the more expensive the camcorder will usually be. So if you buy a model with a small sensor don't expect great videos in low light.
My Samsung HMX-H100 has a small sensor and it makes grainy looking videos in low light, but I got what I paid for, and I expect to take most of my videos outdoors during daytime. This model does 1080i but not 1080p. However it also does 720/60p which works very well for the kinds of videos I like to take (with lots of fast moving scenes). Of course, if someone gave me a new camcorder with a huge image sensor and 1080/60p mode, I would be more than happy to accept it .
If you want to see what a 720/60p video looks like, here is one I took recently:
http://www.youtube.com/watch?v=SJXHWCFN42Q
As for USB speed, you should be able to get at least several megabytes per second transfer speeds from a modern digital camera or camcorder that has a USB2 port. It isn't enough for the computer to have USB2 port, the camera itself also needs to have a USB2 port to get the higher speed, and if there is a USB hub between camera and computer, the hub also needs to have USB2 ports.
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