I can absolutely agree with the above comments, the 'best' all round replacement for the p.o.s. that is in there is the Pioneer AVIC F910BT. It will add GPS , replace the hands free with its own which works better , ipod control etc.. Not only that but, unlike most of the newer AVIC units the software can be modified with several advantages including 'skining' the gfx to match your Alfa and some other things I wont mention. Cheap as well, as there are newer models (which you can't mod).
Fitting it you would require 2 additional cables that don't come in the box. One connect her to the steering controls and the other allows the Blue&Me unit (which is hidden in the DIN slots of the existing radio) to behind the glovebox to make room for an AVIC.
Fitted mine about 3 years ago and haven't a single complaint about it, not one.