Pretty much any HD cam should do a decent job of it; a Flip cam is serviceable and cheap, and many of the high-end cellphones aren't too shabby (especially our Must-have models). If you're shooting directly at the screen, though, it might not hurt to look into a digicam with a little more oomph. The camcorder market is softening, so look to see if a DSLR might do the trick, if you want to spend the cash.
Tell me something about DSLR... I saw Canon 600D... what requirements do I need for sound. I am a basic editor and I cannot do professional level sound corrections and stuff. Do DSLR cameras come with Good sound? Do they support an external microphone.
It might help to get one that supports an external mic. Our camera specs may not always indicate it, but it should generally be noted on the official site if a particular model has a mic jack. Problem is, these cameras are more expensive.
I do not know if the 600D has a mic jack; it's not indicated in the official specs. Some pricier DSLRs do have one, but at those prices (thousands of dollars) you might be better off just getting a camcorder that you know has a jack.