I currently own the FA 77 and the DA *50-135 and used to own the DA 70. Between them, I would probably choose the DA *50-135, mainly due to flexibility. It is sharp at f2.8 throughout the range (a little soft corners at the long end). The DA 70 is only a half stop faster, is a little sharper, but not enough that I would see it as being a great difference.
The FA 77 would be a harder choice (I understand that it is out of your price range), because it is so much faster and is sharp from f1.8. Its biggest down sides are the slower auto focus and pretty bad purple fringing.