Which APS-C Alpha to buy?

You seem to have made your choice about a lens, so what's left is the body.  My vote goes to A77, the A66 is the middle ground where it seems: no one wants to be.

On the other hand, I'm not sure why you disregard the A57, but how about the new A58?  You should be able to get the full specification, and judge about performance from it.  Also it should be available in the next couple of months, so not a long time to wait...

Just some thoughts,

rio