I've had the cams and ECU done on my car and I would definitely say that they are more than worth it, the car's acceleration is vastly improved across the rev range.
You can specify to Autodelta what you're after more torque/more power/both?
Only thing is that you may want even more power after that?
The Autodelta turbo charged 2.0 car will be faster than the stock 3.0 V6, although the power, may be equivalent I believe the torque is higher and the 2.0 car will weigh less.
If you contact firstname.lastname@example.org, you may be able to talk about the logistical problem of getting your car done, I think there may be an agent for them in Greece.