I'm using the figures as recommended by the Alfa workshop at the moment;
Front: Total toe -2.0mm (+/-1.0mm) (Toe-out)
Rear: Total toe +3.0mm (+/-1.0mm) (Toe-in)
The handling is good, but the only snag is that I am getting excess wear on the inside edge of the front tyres; I am therefore going to try -1.0mm total toe on the fronts, or perhaps zero/parallel.
As for the rear, I reckon you need to have some toe-in for stability, which you should get, as long as your rear suspension is sound.
I think that people blame the toe settings for rear end instability, when it's more likely to be worn bushes.