From my experience, anything over 145 is for looks only, if you like them... Even with 155 I have noticed worst roadholding on wet road. I don't know if you can fit 145s on the Gordini wheels, but if you can it is definitely a better choice.
There is no problem to fit the 145R13 tyre on the Gordini rim, however it looks quite ugly, because the beads are wider than the tread.From my experience, anything over 145 is for looks only, if you like them... Even with 155 I have noticed worst roadholding on wet road. I don't know if you can fit 145s on the Gordini wheels, but if you can it is definitely a better choice.