My honest opinion.
It's a good looking car, no denying that.
I find the 1.4 16v, is a bit slow in the low down acceleration stakes, but has ample power when it gets going, between 30 and 60mph, its quite a nippy little thing.
In the insurance stakes, there's little in it between the 1.2 and 1.4 so go for the 1.4.
My eldest daughter has the Alfa 147, 1.9 Mjet, if this is the same engine as fitted to the GP, then it goes like stink, definitely the one to have.
Not sure what it's like on insurance though.
Everyone on here knows my opinions regarding the reliability of the GP.
I'm not alone either, recurrent faults do seem to crop up.
If your'e good with spanners and enthusiastic, go for one.
If your'e not so good with spanners, but have lots of spare cash, again go for one.
If your'e no good with spanners and skint, then i'd think about buying something else.
But that's only my opinion, and no doubt i'll get shot down again.