You like to waste your money.
If 80% of what you will shoot is portrait, then my a 5DMKII and better glass.
While some of the ISO is better on the 5DMKIII and the AF greatly improved, most of that will help the sports or activity shooter.
Current 5DMKII owner who moved up from the 550D about a year ago, and more than happy with the move. The new AF on the 5DMKIII may help me get a slightly better number of keepers, but that is hard for me to justify a $1400 increase in price, where that could go to upgrading my 50 1.4 or 85 1.8 to the L versions, not to mention you will loose reach jumping to FF.
For me, I am saving for another year or so and going to the 1DX or perhaps the large MP on the horizon depending on where it fits capability wise.
For where you are and what you shoot, going to a 5DMKII and then selling your 70-200 F4 IS and going 70-200 F/2.8 IS II is about the same as buying a 5D MKIII but a more significant upgrade.
Given the generations of where the 5DMKII and MKIII are, a 5DMKII will do better than a 5DMKIII with cheap glass.
Generally glass matter more than the body.
Only major upgrade in the MKIII is AF. I shoot sports occasionally, and I could not justify the price jump to only go to the 5DMKIII so saving up another $3K to make a much more significant jump.