have to do a Green Screen project of 15 videos, HDR FX7 or Canon DSLR is the question?

I have a Sony HDR FX7 and was going to use it to film this series. But after reading about the Canon 5D and TSI3 and 7D etc. I am seriously considering buying one. My question is this:

Can I use both cameras or am I going to have huge differences in footage that I wont be able to fix with AE color correction?

Should i just do away with the HDR FX7 and get two dslr's?

Or will I do better with two Sony HDR FX7's?

I want to do a dual camera shoot on a green screen and add a virtual set in order to do How To tutorials. Is it a bad idea to do dual cameras on green screen because of angle shots and virtual set placement?

Thank you everyone in advance, this will be my first green screen shoot, I have up until now just been an AE guy. I have done keying, just never shot the footage.