Which Camera with Video should I choose?

I was looking into a DSLR camera for quite a while now and for now on top of my list are:
Canon D600, Nikon D5100 and Sony SLT-A65
All of them seem to have their pros and Cons. I'm interested in taking pictures as well as shooting videos (more taking pictures than videos, but still videos are VERY important). Which of these camera's would you recommend and why? How should I weigh the pros and cons?

P.S. I have a telephoto sigma lens for Nikon, so that might impact my decision as well.

Cannon is the best

Take yourself down to a camera shop and handle each of your choices.

Being able to use that Nikon lens would make a difference to me.