A99 for sports photography
not a direct help, but i would recommend you to rent the a77 with the 70-200g or 70-400g for a weekend to have a feel, it would be a similar experience to it.
i'm holding on to my a77, the higher fps really helps, and consider if you are shooting sports, the longer reach might compensate for the 1600 cost of the new pdaf.
i have to keep both eyes open to help me shoot sporting events, i guess coming from a700 would be a big improvement vs coming from 7d or d7000.
Nordstjernen have good post about techniques that helps. hope you find them useful.