Okay, so lets say I go with an engine swap for my grande punto. I'm thinking the best call would be the five pot from the fiat stilo abarth. Good call, bad call?

I’ve heard many times that the stilo abarth engine isn’t so reliable

You’d be better with a 20VT+ engine - loads more power, similar footprint, cheap but you’ll probably struggle to find one with decent mileage these days