Hey Savasp30 Welcome to the forum!
There are a lot of good options.
Alfa V6 (from GTV would be easiest)
2.4 5 cylinder Stilo
anything from the Fiat coupe so 2.0 turbo 5 cylinder and 4 cylinder versions.
100hp 1.4 from stilo/panda
The 1.8 from the barchetta and Punto HGT has a bit more power than the Bravo 1.8.
The Stilo also uses the same 1.8 but I don't personaly know just how different it is from all the others. I know the aluminium engine mount that's on the crank side of the block is a different version, you would need to take the cambelt off to swap it. The stilos ive seen have an interesting heat exchanger between the oil and coolant.
Probably loads more options.