Canon 5D Mark II vs. Mark III

I'm considering buying a Canon 5D Mark II for video production, because it would be within my price range if I sold my most expensive lens (80-200 f/2.8) as well as my current Nikon D300 camera body.  The Mark III would have to wait until I shot either a few more weddings or wait until the successor model is released and the Mark III drops in price.

Used 5D Mark II models in top condition cost about $1,400 on Adorama.  B&H only has one right now in a 7 rating condition.

Current price: $1,800 (sale)  vs. $2,975 (sale)
Regular prices: $2,200 Mark II vs. $3,500 Mark III
B&H's special price on both cameras includes a SanDisk 16GB CompactFlash Memory Card Extreme 400x UDMA (valued at $57)

Information via Wikipedia Canon Mark 5D Mark III page:

22.3 megapixels compared to 21.1 megapixels
61 Point AF + 41 Crosstype AF compared to 9 Point AF + 6 Assist Points.
100–25600 ISO compared to 100–6400
6 frames per second continuous shooting compared to 3.9 frame/s
100% viewfinder, compared to 98% coverage
Larger 3.2-inch (81 mm) LCD with 3:2 aspect ratio, compared to 3.0-inch (76 mm) at 4:3.
Dual card slots—one CompactFlash (CF) with full UDMA support, and one SD (including SDHC and SDXC cards, but does not exploit the UHS-I speed class). The Mk II has only one CF slot.

Film and Video shot on the (2008 model) Mark II:

An episode of House from the 2010 season was filmed entirely on the Mark II.
Black Swan (also used 16mm film and the 7D)
Drive (some shots)
127 Hours (used the 5D Mark II, 7D, and other cameras)
Like Crazy (filmed entirely on the 7D)
Some shots in Limitless (2011) were made on it.
The Bourne Legacy (some shots)
The Avengers (some shots), also some using the 7D.
Captain America (some shots)
Medium TV Show (7D for some shots)