Buying a new Camera. Need advice?

My budget: $1200
I have never owned a SLR or any sort of camcorder before. I mainly want to buy a camera to take videos and shots for music videos. However, if it came with good still-picture taking qualities, it wouldnt be bad either. The two brands that I'm looking at are Canon and Nikon.

I have this one from canon: http://www.usa.canon.com/...ia_hf_s30#

http://www.usa.canon.com/..._is_ii_kit

and this fromNikon:
http://www.nikonusa.com/...s.Overview

In all honesty, I don't understand difference between a camcorder and a SLR that can take videos. My friend has the Nikon D3100 and he says it's video quality is very good. But I don't know.

Added (1). If you guys have other suggestions on different cameras that aren't mentioned on the top, feel free to bring them up.

Jack video quality of a camcorder will be great, but there are few problem with that,
well camera are not ment to shoot video so you can't shoot video more than 30 minutes, or more than 4gb at a time, so if you want to shoot an hour video you have to do in pieces,
secondly the file size is 1.5 times bigger than that of video camera.

which is best camera in the list? Well nikon d7000 is the best, it has all the features that t3i or d3100 has and even has some more,

if you just want to shoot picture and take occasional video d3100 is more than enough,

if you are semi pro and want best of both world d7000 is all you need.

if you need to shoot video go for video camera.

there's a hybrid cam, from NEX-VG10, which cost 2000$ but has both feature. It's a camera and also a video camera.

if you are fine with short duration of movie and ready to deal with deal the problem, all you need is d7000.

You should buy Nikon D7000.

Nikon's D7000 features a 16.2 MP DX-format CMOS sensor, 6 fps continuous shooting and breathtaking Full 1080p HD Movies with full time autofocus.
Features:-

*16.2MP CMOS sensor
*1080p HD video recording with mic jack for external microphone
*ISO 100-6400 (plus H1 and H2 equivalent to ISO 12, 800/25, 600)
*39-point AF system with 3D tracking
*2016 pixel metering sensor
*Scene Recognition System (see 2016 pixel sensor, above) aids metering + focus accuracy
*Twin SD card slots
*3.0 inch 921k dot LCD screen
*New Live View/movie shooting switch
*Full-time AF in Live View/movie modes
*Up to 6fps continuous shooting
*Lockable shooting mode dial