I'd vote 5d3 as well, if you're making money off of it and people are paying. As others have pointed out, online (even Amazon) you can get a 5d3 body for less than most/all local brick & mortar stores.
1) Reduced rolling shutter. It's not gone, but it's better.
2) Significantly reduce moire.
3) 720p50/60 modes, although 1080p is still only 24/30.
4) You can crank the ISO up 1-2 stops above the 5d2 if you have to.
I have both, and while MagicLantern is currently only alpha/beta on the 5d3, last I heard it was coming along well towards full support, although it's not there yet. I do have ML on my 5d2, and for video it can add quite a few good things, such as zebra striping, focus peaking, 10x zoom for live focusing (no auto-focusing).
If you really aren't sure, and you're in LA, I'd be willing to meet you somewhere for a couple of hours and let you play around with the video on my 5d2 & 5d3, just PM me.