Welcome to the forum Ste.
I've always liked the Corrado, a great Coupé with solid build quailty. Something you might find the Fiat lacks, but we put this down as being character.
As Bridges said, the 16VT is the same engine as used in the Integrale. A cracking engine, with great heritage
but it has to be said that now the boundries are being pushed with regards to tuning the 20VT engines so IMHO they are the ones to go for. A much more modern engine design, with that gorgeous five pot growl.
Have a look at the buyers guide, some great information there on the differences in the models.