im going autronic due to the fact of it being what a lot of the big power cosworths are using. im aiming for 500-560 horsepower and i just think its a very professional setup.
Of course it is expensive (far more so than emerald) but from what i have heard about the mapping ability on autronic and the increase in power throughout the curve im definately going with it.
I also think a couple of quite important people on the scene are using/supplying autronic as a way forward so thats where my moneys going

Hope my opinion helps