Can't they just make a D90 for A Mount? I hate to say this but it's really an ideal choice for OVF users.
Decent spec, good handling, nice size OVF at a reasonable price. Shove a 16mp CMOS in there and you're good to go
If you want to go one higher than that you end up with a D7000 equivalent juiced up build/spec which would sit at the A77 level
I can't see it myself as Sony seem intent on SLT and the small ish Penta mirror (I assume to facilitate the fast AF live view) 0.92x might be pushing it brightness wise for a Penta mirror, the D90 is 0.94x with a Pentaprism the A700 is 0.90x