Re: "Half facelift"
In my opinion the facelifted 166 with brera style lamps without the chrome bits between the lights and the grille is by far the best looking 166, combining the beautiful centre grille of the latest alfas with an aggressive yet classy set of lights. It looks sufficiently different to the 159 to be identified as a 166. The only other thing I would try would be to remove the chrome strips between the two spotlights, so as to make the front even more clean, and different to the 159.
Any of you lads computer wizards want to post a photo as I am describing?