Let me preface this by saying that I haven't driven the Abarth (just the 500 Sport), but I would say your current ride does everything the Abarth will do, and with much greater civility.
For the money there are so many other appealing options out there IMO. The Abarth is probably a hoot to drive, but as DD I can see the novelty wearing off rather quickly. My money would go to the BRZ, Genesis 2.0T, Mazda 3, or even the Veloster Turbo before the Fiat. Just my $0.02.
FWIW, Road & Track seemed to quite like the Abarth in spite of it's rough ride, subpar fuel economy, and hefty price tag, so I guess not everything can be measured by numbers: