Which camera would you choose out of these?

Http://www.ryda.com.au/Nikon-D5100-DSLR-Camera-18-55-55-300mm-Lens-p/d510055300vrtw.htm
http://www.ryda.com.au/Canon-EOS-60D-DSLR-Camera-Twin-Lens-Kit-p/eos60dtkis.htm
http://www.ryda.com.au/Canon-EOS-600D-Digital-SLR-Camera-Twin-IS-Lens-p/eos600dtkis.htm

Added (1). 60d, 600d or d5100

You've named the same camera twice… The 60D for sure.

I'm a nikon man so I'd go for the d5100. The 60D is a higher class of camera though.

On this list I wouldn't pick any of them. What I would do is wait, and see what Nikon and Canon do between now and this summer, those cameras are getting a little old. While the high end dSLRs might only get refreshed every 3-4 years, the lower end stuff gets refreshed a lot sooner. Check out Sony's new Alpha A57, get familiar with it, and then compare it to the new Canon/Nikons, and then make a choice.

I know you didn't list it, but get the D7000 Nikon if you can

Out of your list I would go for the 60D